CBSE Class 8 Science Chapter 10 Light Mirrors And Lenses MCQs Set 03

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

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Question: When light strikes a mirror along the normal, as described in the law of reflection, what would be the measure of the angle of incidence?
A. 90°
B. 0°
C. 45°
D. cannot be determined
Show Answer & Explanation

Answer: (B) 0°

Explanation:
The angle of incidence is measured between the incident ray and the normal. When light travels along the normal, it strikes the mirror perpendicular to the surface, making the angle between them zero degrees.

Question: In the chapter, spherical mirrors are created by a specific manufacturing process. Which surface receives the reflective coating to form a concave mirror?
A. the inner curved surface
B. the outer curved surface
C. both surfaces equally
D. neither surface—only the flat side
Show Answer & Explanation

Answer: (B) the outer curved surface

Explanation:
According to 'A step further' in section 10.1, when a reflective coating like aluminium is applied on the outer curved surface of ground glass, it forms a concave mirror.

Question: During Activity 10.3, as an object is slowly moved away from a concave mirror, which sequence correctly describes what happens to the image?
A. it remains erect and enlarged throughout
B. it becomes inverted and keeps getting smaller
C. it stays the same size but changes orientation
D. it grows larger regardless of distance
Show Answer & Explanation

Answer: (B) it becomes inverted and keeps getting smaller

Explanation:
The chapter explains that when the object is moved farther away from a concave mirror, the image becomes inverted, initially remaining enlarged but then progressively diminishing in size.
• Initially close: erect and enlarged
• As distance increases: becomes inverted
• Continues getting smaller as object moves farther

Question: What fundamental structural difference determines whether a spherical mirror acts as concave or convex?
A. the thickness of the glass used
B. whether the reflecting surface curves inward or outward
C. the diameter of the mirror's circular outline
D. the type of reflective coating applied
Show Answer & Explanation

Answer: (B) whether the reflecting surface curves inward or outward

Explanation:
A concave mirror has a reflecting surface curving inward, while a convex mirror curves outward. This curvature difference is what causes their distinctly different optical properties and image formation characteristics.

Question: In Activity 10.5, when the extended chart paper portion is bent along the table edge, the reflected beam disappears and then reappears when flattened. What optical principle does this demonstrate?
A. the angle of incidence equals the angle of reflection
B. the incident ray, normal, and reflected ray must lie in the same plane
C. light always travels in straight lines
D. reflection occurs only on flat surfaces
Show Answer & Explanation

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

Explanation:
Bending the paper creates a new plane perpendicular to the original one. The reflected beam vanishes because the incident ray, normal, and reflected ray no longer occupy the same plane—when the paper is flattened, they realign in the same plane and the beam reappears.

Question: Why would a convex mirror be preferred over a plane mirror for use as a vehicle side-view mirror?
A. it produces a larger and erect image of the area behind
B. it creates inverted images that are easier to interpret
C. it reflects light more efficiently than plane mirrors
D. it reduces glare from headlights of other vehicles
Show Answer & Explanation

Answer: (A) it produces a larger and erect image of the area behind

Explanation:
Convex mirrors provide a much wider area of view than plane mirrors because the curved surface allows a larger field of vision. The image remains erect and diminished, which is why the warning states 'Objects in mirror are closer than they appear'—they look smaller than they actually are due to the wider field captured.

Question: When Activity 10.6 uses multiple parallel beams of light with different mirrors, which mirror type causes the reflected beams to converge toward a single point?
A. plane mirror
B. convex mirror
C. concave mirror
D. both concave and convex equally
Show Answer & Explanation

Answer: (C) concave mirror

Explanation:
The chapter states that when multiple parallel beams fall on a concave mirror, the reflected beams converge—they get closer together and meet at a point. This is due to the inward-curving surface that focuses light.

Question: In Activity 10.8, when text appears enlarged when viewed through a water drop on glass, the water drop is functioning as which optical device?
A. a concave lens
B. a convex lens
C. a concave mirror
D. a plane mirror
Show Answer & Explanation

Answer: (B) a convex lens

Explanation:
The water drop with its curved outer surface acts like a simple convex lens. The curved surface of the water drop causes light from the text below to refract, making the letters appear larger—the same magnifying effect produced by a magnifying glass, which is also a convex lens.

Question: What is the primary reason why a concave mirror can ignite paper when sunlight is focused on it, as shown in Activity 10.7?
A. the mirror produces heat through friction
B. the converging light concentrates thermal energy at a small point
C. the mirror's curved surface absorbs sunlight
D. the reflection process creates new light energy
Show Answer & Explanation

Answer: (B) the converging light concentrates thermal energy at a small point

Explanation:
Light from the Sun reflects off the concave mirror and converges to a bright spot on the paper. This concentration of light rays at one point produces intense heat sufficient to ignite the paper.

Question: Based on the characteristics described for concave and convex lenses in Activity 10.9, which statement is true?
A. both lenses always produce enlarged images
B. a concave lens always makes objects appear smaller regardless of distance
C. a convex lens produces inverted images only when objects are nearby
D. both lenses produce images of identical size at identical distances
Show Answer & Explanation

Answer: (B) a concave lens always makes objects appear smaller regardless of distance

Explanation:
The chapter explicitly states that an object placed behind a concave lens and seen through it always appears erect and diminished in size, regardless of how its distance from the lens changes.

Question: When viewing mirrors from the side with your eye at their level in Activity 10.2, a concave mirror's reflecting surface appears different from a convex mirror's because it curves in which direction?
A. outward, like a dome
B. inward, like a bowl
C. both curve identically but have different coatings
D. the curvature cannot be determined from the side
Show Answer & Explanation

Answer: (B) inward, like a bowl

Explanation:
A concave mirror curves inward, resembling a bowl when viewed from the side. This inward curvature is what distinguishes it visually from a convex mirror, which bulges outward like a dome.

Question: In the law of reflection derived from Activity 10.4, if a light ray strikes a mirror at an angle of incidence of 35°, what must be the angle of reflection?
A. 35°
B. 55°
C. 90°
D. 145°
Show Answer & Explanation

Answer: (A) 35°

Explanation:
The law of reflection states that the angle of incidence equals the angle of reflection. If the incident ray makes a 35° angle with the normal, the reflected ray must also make a 35° angle with the normal on the opposite side.

Question: How do the images produced differ when the same object is placed at equal distance behind a convex lens versus a concave lens?
A. both produce identical erect and diminished images
B. the convex lens produces an inverted image while the concave lens produces an erect image
C. the concave lens always produces smaller images than the convex lens
D. both produce inverted images of the same size
Show Answer & Explanation

Answer: (B) the convex lens produces an inverted image while the concave lens produces an erect image

Explanation:
According to Activity 10.9, at a small distance, a convex lens produces an erect and enlarged image, while a concave lens always produces an erect and diminished image. These optical behaviours are fundamentally different due to their opposite curvatures.

Question: In Activity 10.10, when multiple parallel light beams pass through a thin transparent glass plate, how does the emergent beam differ from when passing through a convex lens?
A. the glass plate disperses the beams while the lens converges them
B. both produce identical convergence of beams
C. the glass plate converges while the lens disperses
D. neither device affects the beam's direction
Show Answer & Explanation

Answer: (A) the glass plate disperses the beams while the lens converges them

Explanation:
A thin transparent glass plate allows parallel light to pass through without altering beam direction. In contrast, a convex lens converges the parallel beams to a focal point. This difference is why a convex lens is called a converging lens.

Question: Why would a dentist specifically choose to hold a special mirror close to the inside of a patient's mouth for tooth examination rather than at a distance?
A. the mirror only works effectively at close range
B. the image is erect and enlarged when held close, providing a better view
C. distance causes the mirror to produce inverted images that are confusing
D. the mirror's reflective power increases at shorter distances
Show Answer & Explanation

Answer: (B) the image is erect and enlarged when held close, providing a better view

Explanation:
The dentist uses a concave mirror, which produces an erect and enlarged image when the object is placed close to it. This magnified erect view inside the mouth allows the dentist to see teeth details clearly—a practical application of the concave mirror's image properties at short distances.

Question: When looking at her reflection in the inner curved side of a metallic spoon, Meena notices that her face appears upside down. Based on the chapter, which characteristic of this type of mirror is responsible for creating an inverted image?
A. The mirror surface curves outward, spreading light rays
B. The mirror surface curves inward, causing light rays to converge
C. The mirror is made of shiny metal rather than glass
D. The spoon is held very close to the face
Show Answer & Explanation

Answer: (B) The mirror surface curves inward, causing light rays to converge

Explanation:
A concave mirror (curved inward) converges reflected light rays, which produces the inverted image characteristic that Meena observed. The inward curvature is what fundamentally changes how light reflects compared to a plane mirror.

Question: In Activity 10.4, a student measures that light strikes a mirror at an angle of 25° from the normal. According to the law of reflection, at what angle will the reflected ray depart from the normal?
A. 25°
B. 65°
C. 35°
D. 55°
Show Answer & Explanation

Answer: (A) 25°

Explanation:
The first law of reflection states that the angle of incidence equals the angle of reflection. Both angles are measured from the normal to the mirror surface.

Question: A vehicle manufacturer needs to choose between a plane mirror and a convex mirror for the side-view mirror. Why would the convex mirror be the better choice despite making objects appear smaller?
A. It provides a wider field of view of the traffic behind
B. It shows objects in their true size and position
C. It eliminates the need for drivers to turn their heads
D. It makes all reflected images appear erect and enlarged
Show Answer & Explanation

Answer: (A) It provides a wider field of view of the traffic behind

Explanation:
Although a convex mirror diminishes the image size, the chapter specifically notes that because the mirror is curved outward, it provides a much wider area of the road behind the vehicle, allowing drivers to see more traffic.

Question: When Activity 10.5 demonstrates that the reflected beam disappears when the chart paper is bent but reappears when flattened, this observation supports which aspect of the laws of reflection?
A. The angle of incidence must equal the angle of reflection
B. The incident ray, normal, and reflected ray must all lie in the same plane
C. Light always travels in straight lines from the mirror
D. Reflection only occurs on flat surfaces
Show Answer & Explanation

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

Explanation:
Bending the paper creates a new plane, and the reflected beam—which must exist in the plane of the incident ray and normal—no longer aligns with the bent surface. This directly demonstrates the second law of reflection.

Question: In Activity 10.6, when multiple parallel light beams are directed at three different mirror types, the beams behave distinctly with each. Which outcome corresponds to a concave mirror?
A. The reflected beams remain parallel to each other
B. The reflected beams spread apart in different directions
C. The reflected beams draw closer together toward a point
D. The reflected beams become perpendicular to the surface
Show Answer & Explanation

Answer: (C) The reflected beams draw closer together toward a point

Explanation:
The chapter explains that a concave mirror converges (brings together) parallel light beams because of its inward-curving shape, whereas a convex mirror diverges them and a plane mirror keeps them parallel.

Question: A student holds a magnifying glass over a newspaper to read small print and observes the text becomes larger. According to Activity 10.8 and the water-drop experiment, what optical property of the magnifying glass makes this enlargement possible?
A. It is made of a material that absorbs light wavelengths
B. It has a concave shape that spreads light rays apart
C. It has a convex shape that concentrates light rays together
D. It reflects light like a mirror rather than allowing it to pass through
Show Answer & Explanation

Answer: (C) It has a convex shape that concentrates light rays together

Explanation:
A magnifying glass is a convex lens, thicker in the middle, which converges light rays and produces an enlarged image when an object is placed close to it—the same principle demonstrated by the water drop in the chapter's activity.

Question: When an object is placed behind a concave lens and viewed through it at any distance, the chapter states that the object always displays one specific characteristic. Which of the following describes this characteristic?
A. Inverted and enlarged
B. Erect and enlarged
C. Erect and diminished
D. Inverted and diminished
Show Answer & Explanation

Answer: (C) Erect and diminished

Explanation:
• A concave lens is a diverging lens
• It always produces an erect image
• The image size is always smaller (diminished) than the object
• These properties remain consistent regardless of object distance

Question: In Activity 10.7, when sunlight is focused onto paper using a concave mirror, the paper eventually burns and produces smoke. What causes the sufficient heat buildup at the focused spot?
A. The mirror generates heat through friction with light
B. The curvature of the mirror amplifies the Sun's temperature
C. Light from the Sun becomes concentrated into a small area after reflection
D. The dark spot on the paper absorbs light more effectively
Show Answer & Explanation

Answer: (C) Light from the Sun becomes concentrated into a small area after reflection

Explanation:
The bright spot forms because the concave mirror converges (concentrates) the parallel rays of sunlight into a single small area, which produces intense heat capable of igniting the paper.

Question: During Activity 10.3, a student observes that when an object moves from being close to a concave mirror to a position far away, the image transitions from erect-and-enlarged to inverted-and-diminishing. What conclusion about spherical mirrors can be drawn from this observation?
A. Concave mirrors always produce the same type of image regardless of object position
B. Image characteristics depend on the distance between the object and the mirror
C. Convex and concave mirrors produce identical images at all distances
D. Object distance has no effect on how spherical mirrors form images
Show Answer & Explanation

Answer: (B) Image characteristics depend on the distance between the object and the mirror

Explanation:
This activity directly demonstrates that the size and orientation of the image formed by a concave mirror change as the object distance changes, showing that position matters—unlike plane mirrors which produce the same image regardless of distance.

Question: The chapter describes that spherical mirrors are created by grinding and polishing a flat glass piece into a curved surface, then applying a reflective coating. If a reflective coating is applied on the inner curved surface of the ground glass, which type of mirror results?
A. A plane mirror that reflects normally
B. A convex mirror with outward-curving reflection
C. A concave mirror with inward-curving reflection
D. A curved mirror with mixed properties
Show Answer & Explanation

Answer: (B) A convex mirror with outward-curving reflection

Explanation:
When the coating is applied on the inner (inside) curved surface, the outer surface becomes the reflecting surface, which curves outward—making it a convex mirror.

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