CBSE Class 8 Science Chapter 10 Light Mirrors And Lenses MCQs Set 02

Science Objective Questions and Answers: Chapter 10 Light Mirrors And Lenses

Review structured MCQ sets for Class 8 Science Chapter 10 Light Mirrors And Lenses. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Download Chapter 10 Light Mirrors And Lenses MCQs with Answers

Access the complete set of multiple-choice questions for Chapter 10 Light Mirrors And Lenses below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

Question: When Meena's brother stood farther away from the curved mirror at the science centre and appeared upside down, what type of spherical mirror was he viewing?
A. a convex mirror
B. a concave mirror
C. a plane mirror
D. a flat glass surface
Show Answer & Explanation

Answer: (B) a concave mirror

Explanation:
The chapter states that when an object is moved farther away from a concave mirror, the image becomes inverted. Since Meena's brother appeared upside down at a greater distance, he was looking at a concave mirror.

Question: Which statement correctly describes how spherical mirrors are actually manufactured according to the chapter?
A. by slicing a hollow glass sphere into curved pieces
B. by grinding and polishing a flat glass piece and applying a reflective coating
C. by melting glass and shaping it into curved forms
D. by bending glass sheets under high temperature
Show Answer & Explanation

Answer: (B) by grinding and polishing a flat glass piece and applying a reflective coating

Explanation:
The 'A step further' section explicitly explains that spherical mirrors are created by grinding and polishing a flat glass piece into a curved surface, then applying a reflective coating like aluminium on either the outer or inner surface depending on the mirror type needed.

Question: When you stand in front of a concave mirror at the exact point where your image appears inverted and at the same size as your actual body, what can you infer about your distance from the mirror?
A. you are very close to the mirror surface
B. you are at a moderate distance from the mirror
C. you are very far from the mirror
D. distance does not matter for concave mirrors
Show Answer & Explanation

Answer: (B) you are at a moderate distance from the mirror

Explanation:
According to Activity 10.3, a concave mirror produces an image that changes from erect and enlarged (when close) to inverted and initially enlarged (at moderate distances). The transition point where the image becomes inverted but remains approximately life-sized occurs at a moderate distance from the mirror.

Question: Why is the warning 'Objects in mirror are closer than they appear' specifically placed on vehicle side-view mirrors rather than on regular plane mirrors?
A. because side-view mirrors reflect light from farther distances than plane mirrors do
B. because convex mirrors form diminished images that make objects seem farther away than they actually are
C. because convex mirrors converge light rays onto the mirror surface
D. because convex mirrors cannot be adjusted for proper viewing
Show Answer & Explanation

Answer: (B) because convex mirrors form diminished images that make objects seem farther away than they actually are

Explanation:
• Convex mirrors always form erect and diminished (smaller) images
• When objects appear smaller in a mirror, viewers perceive them as being farther away than they truly are
• This creates a safety hazard, necessitating the warning to drivers

Question: In Activity 10.4, if a light beam strikes a mirror and the angle between the incident ray and the normal is measured as 35°, what must the angle between the reflected ray and the normal be?
A. 90°
B. 55°
C. 35°
D. 70°
Show Answer & Explanation

Answer: (C) 35°

Explanation:
The law of reflection states that the angle of incidence equals the angle of reflection. Both angles are measured from the normal to the reflecting surface, so if the incident ray makes a 35° angle with the normal, the reflected ray must also make a 35° angle with the normal.

Question: When multiple parallel light beams pass through a thin transparent glass plate compared to passing through a convex lens, what is the key difference in the emergent beams?
A. the glass plate converges the beams while the lens diverges them
B. the glass plate disperses the beams while the lens converges them
C. both items converge the beams identically
D. the glass plate leaves the beams parallel while the lens converges them
Show Answer & Explanation

Answer: (D) the glass plate leaves the beams parallel while the lens converges them

Explanation:
Activity 10.10 demonstrates that parallel light passing through a thin glass plate continues as parallel beams unchanged, whereas the same parallel beams passing through a convex lens converge toward a point, making the lens act as a converging device.

Question: How would you experimentally distinguish between a concave lens and a convex lens by observing their effects on light?
A. shine parallel light beams through each and observe whether they converge or diverge
B. measure the thickness of each lens at its center
C. place an object at the same distance behind each lens and compare image sizes only
D. check which lens is heavier
Show Answer & Explanation

Answer: (A) shine parallel light beams through each and observe whether they converge or diverge

Explanation:
• A convex (converging) lens brings parallel beams together toward a focal point
• A concave (diverging) lens spreads parallel beams outward
• This observable difference in light behavior is the most reliable way to distinguish them experimentally, as shown in Activity 10.10

Question: Based on Activity 10.2, if you place a concave and convex mirror side by side on a table with their reflecting surfaces facing upward, and view them from the side at their level, which mirror's reflecting surface will appear to curve toward you?
A. the convex mirror, because it curves outward
B. the concave mirror, because it curves inward
C. both will appear identical from the side
D. neither will show visible curvature from this angle
Show Answer & Explanation

Answer: (A) the convex mirror, because it curves outward

Explanation:
When viewing from the side at eye level, a convex mirror's reflecting surface curves outward toward you, making this curvature visibly apparent. A concave mirror's inward curve would make it appear to recede away from your viewing angle.

Question: In solar concentrator applications described in the chapter, why is the concentrated sunlight able to ignite paper and melt steel?
A. the heat is generated by friction between the mirror and the paper
B. the curved mirror splits sunlight into different colours that burn hotter
C. reflected light from the mirror is concentrated into a small area producing intense heat
D. the mirror converts light energy into a different type of energy
Show Answer & Explanation

Answer: (C) reflected light from the mirror is concentrated into a small area producing intense heat

Explanation:
Activity 10.7 demonstrates that a concave mirror converges multiple parallel rays of sunlight onto a single bright spot on paper. When many light rays concentrate on a small area, the combined energy produces sufficient heat to ignite paper, which is the same principle used in solar furnaces for melting steel.

Question: When you look at an object through a water drop sitting on glass (as in Activity 10.8), and the letters below appear enlarged, what optical principle is this water drop demonstrating?
A. refraction of light by a diverging surface
B. convergence of light by a convex curved surface
C. lateral inversion by a plane surface
D. dispersion of white light into colours
Show Answer & Explanation

Answer: (B) convergence of light by a convex curved surface

Explanation:
The water drop forms a convex shape with curved surfaces that bulges outward. When light passes through this curved surface, it converges—the same principle as a convex lens. This converging action causes the letters beneath to appear enlarged, demonstrating how convex surfaces bend light rays inward.

Question: According to the chapter, which of the following best explains why a dentist would choose a concave mirror rather than a plane mirror for examining teeth?
A. a plane mirror would show teeth inverted
B. a concave mirror can be held at a close distance to provide an enlarged view of the teeth
C. a plane mirror cannot reflect light from inside the mouth
D. a concave mirror diverges light to cover a wider area
Show Answer & Explanation

Answer: (B) a concave mirror can be held at a close distance to provide an enlarged view of the teeth

Explanation:
The chapter explains that a concave mirror used by a dentist provides an enlarged view of teeth when held close to them inside the mouth. This magnifying property of concave mirrors at small distances is essential for the detailed examination required in dental work.

Question: In Activity 10.9, when an object is gradually moved farther from a convex lens, what sequence of changes occurs in how the object appears?
A. it remains erect and the same size throughout
B. it starts erect and enlarged, then becomes inverted and increasingly diminished
C. it immediately becomes inverted and stays that way
D. it becomes inverted and enlarged at all distances
Show Answer & Explanation

Answer: (B) it starts erect and enlarged, then becomes inverted and increasingly diminished

Explanation:
According to Activity 10.9, when viewing through a convex lens: at small distances the object appears erect and enlarged; as distance increases the object appears inverted initially enlarged then becomes progressively smaller. This sequence mirrors the behavior of concave mirrors.

Question: What property must the normal at the point of incidence have in relation to the mirror surface, according to the definition given in Activity 10.4?
A. it must be parallel to the mirror surface
B. it must make a 90° angle with the mirror surface
C. it must be perpendicular to the incident ray
D. it must be at 45° to the mirror surface
Show Answer & Explanation

Answer: (B) it must make a 90° angle with the mirror surface

Explanation:
The chapter defines the normal as a line drawn from the point where the incident ray strikes the mirror, making an angle of 90° (a right angle) to the line representing the mirror surface. This perpendicular line is fundamental to measuring angles of incidence and reflection accurately.

Question: When the chart paper is bent along the table edge in Activity 10.5, why does the reflected beam of light disappear from the bent portion?
A. bending the paper blocks the light completely
B. the bent paper creates a new plane that breaks the alignment between the incident ray, normal, and reflected ray
C. the mirror automatically stops reflecting when paper is bent
D. bending changes the colour of the light beam
Show Answer & Explanation

Answer: (B) the bent paper creates a new plane that breaks the alignment between the incident ray, normal, and reflected ray

Explanation:
The second law of reflection requires that the incident ray, normal, and reflected ray all lie in the same plane. When the paper is bent, a new plane is created that breaks this required alignment, causing the reflected beam to no longer appear on the bent portion of the paper.

Question: If you were to apply the laws of reflection to understand how a concave mirror converges multiple parallel light rays, which law directly explains why the reflected rays all meet at a point?
A. only the first law (angle of incidence equals angle of reflection) explains this phenomenon
B. only the second law (coplanar arrangement) explains this phenomenon
C. the curved shape of the mirror causes each ray to follow the law of reflection at different angles, resulting in convergence
D. neither law of reflection applies to curved mirrors
Show Answer & Explanation

Answer: (C) the curved shape of the mirror causes each ray to follow the law of reflection at different angles, resulting in convergence

Explanation:
While spherical mirrors follow both laws of reflection at every point on their curved surface, convergence occurs because parallel rays hit different parts of the curved mirror at different angles. Each ray obeys the law of incidence equals reflection, but due to the mirror's curvature, the reflected rays all happen to converge toward a single focal point.

Question: When Meena looked at the outer curved surface of a shiny metallic spoon, she observed that her image appeared erect but smaller in size. Which term best describes this type of image characteristic?
A. Enlarged and inverted
B. Diminished and erect
C. Magnified and inverted
D. Same size and erect
Show Answer & Explanation

Answer: (B) Diminished and erect

Explanation:
The chapter describes that when viewing the outer curved surface of a spoon, which bulges outward like a convex mirror, the image is erect but smaller than the actual object—precisely the behavior called 'diminished and erect.'

Question: In Activity 10.1, a shiny metallic spoon acts like a mirror because its curved surface can reflect light. If you flip the spoon to view the inner curved side, the image characteristic most likely changes to which of the following?
A. Remaining erect and becoming smaller
B. Becoming inverted and larger at close distance
C. Remaining erect and becoming larger
D. Becoming inverted and smaller
Show Answer & Explanation

Answer: (B) Becoming inverted and larger at close distance

Explanation:
The inner curved surface of a spoon curves inward (like a concave mirror), producing an inverted image when held close to the face, as confirmed in the chapter's description of Activity 10.1 observations.

Question: The chapter explains that spherical mirrors are created by grinding and polishing a flat glass piece into a curved surface. Depending on where the reflective coating is applied, different mirrors form. If the coating is applied on the inner curved surface, what type of mirror results?
A. Convex mirror
B. Plane mirror
C. Concave mirror
D. Spherical mirror
Show Answer & Explanation

Answer: (A) Convex mirror

Explanation:
According to the 'A step further' section in the chapter, when the reflective coating like aluminium is applied on the inner curved surface, it forms a convex mirror. When applied on the outer curved surface, it forms a concave mirror.

Question: During Activity 10.3, students observed that when an object is placed close to a concave mirror, the image appears enlarged and erect. However, when the same object is moved farther away, the image behaviour changes. What happens to the image as distance increases?
A. It remains enlarged and erect throughout
B. It becomes inverted and gradually diminishes in size
C. It becomes smaller but remains erect
D. It disappears completely
Show Answer & Explanation

Answer: (B) It becomes inverted and gradually diminishes in size

Explanation:
The chapter states that in a concave mirror, when the object is moved farther away, the image becomes inverted, initially enlarged in size, and then keeps getting smaller—a characteristic behaviour unique to concave mirrors.

Question: A convex mirror is installed at a busy road intersection. Which combination of characteristics makes it particularly suitable for this traffic safety application?
A. It produces enlarged, inverted images over a large area
B. It provides erect, diminished images covering a wide field of view
C. It creates real, magnified images at various distances
D. It produces inverted, real images of approaching vehicles
Show Answer & Explanation

Answer: (B) It provides erect, diminished images covering a wide field of view

Explanation:
• Convex mirrors form erect, diminished images always
• The curved outward shape provides a much wider area of visibility
• This wide coverage helps drivers see traffic approaching from both sides, preventing collisions—the exact reason stated in the chapter for installing such mirrors at intersections.

Question: In Activity 10.4, a student sets up an experiment where a light ray falls on a plane mirror along the normal (perpendicular to the surface). What would be the angle of incidence and angle of reflection in this scenario?
A. Angle of incidence = 40°, angle of reflection = 40°
B. Angle of incidence = 0°, angle of reflection = 0°
C. Angle of incidence = 90°, angle of reflection = 90°
D. Angle of incidence = 45°, angle of reflection = 45°
Show Answer & Explanation

Answer: (B) Angle of incidence = 0°, angle of reflection = 0°

Explanation:
When light strikes along the normal, it makes zero angle with the normal itself. The chapter explicitly states that when the incident beam falls on the mirror along the normal, both the angle of incidence and angle of reflection would be zero.

Question: In Activity 10.5, when the extended portion of chart paper is bent along the table edge, the reflected beam of light disappears from view. This observation demonstrates which law of reflection?
A. The angle of incidence equals the angle of reflection
B. The incident ray, normal, and reflected ray all lie in the same plane
C. Light travels in straight lines
D. The normal is perpendicular to the mirror surface
Show Answer & Explanation

Answer: (B) The incident ray, normal, and reflected ray all lie in the same plane

Explanation:
The chapter explains that bending the paper creates a new plane, which breaks the alignment between the incident ray, normal, and reflected ray. This directly illustrates the second law of reflection—that all three elements must lie in the same plane for the reflection to be observed.

Question: When multiple parallel beams of light fall on different types of mirrors in Activity 10.6, the reflected beams behave distinctly. For a concave mirror, the reflected beams show which behaviour?
A. They remain parallel to each other
B. They spread outward in diverging paths
C. They come together, or converge, toward a point
D. They reflect at random angles
Show Answer & Explanation

Answer: (C) They come together, or converge, toward a point

Explanation:
The chapter clearly states that when multiple parallel beams of light fall upon a concave mirror, the multiple reflected beams get closer—they converge. This convergence property is fundamental to how concave mirrors can concentrate light and heat.

Question: A dentist uses a special mirror to examine a patient's teeth inside the mouth. The mirror provides an enlarged view when held close to the teeth. Which property of mirrors explains why an enlarged view is possible in this situation?
A. Convex mirrors always enlarge objects
B. Concave mirrors can form enlarged, erect images when the object is placed close to them
C. Plane mirrors magnify objects at close distances
D. All spherical mirrors enlarge images
Show Answer & Explanation

Answer: (B) Concave mirrors can form enlarged, erect images when the object is placed close to them

Explanation:
The chapter specifically mentions that a dental mirror is a concave mirror providing an enlarged view of teeth when held close to the teeth inside the mouth. This matches the behaviour established in Activity 10.3 where close objects in concave mirrors appear enlarged and erect.

Question: In Activity 10.8, when a small water drop is placed on an oiled glass surface over printed text, the letters below appear enlarged. This magnification effect demonstrates that the water drop is functioning as which type of lens?
A. A plane lens
B. A concave lens
C. A convex lens
D. A diverging lens
Show Answer & Explanation

Answer: (C) A convex lens

Explanation:
The water drop has a curved surface bulging outward and causes the text to appear larger, making it behave as a convex lens. The chapter explicitly draws this connection, noting that the water drop acts like a simple lens and comparing it to a magnifying glass, which is also a convex lens.

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Practice MCQs for Class 8 Science Chapter 10 Light Mirrors And Lenses

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