Practice Worksheets for Class 8 Science: Chapter 16 Light
Review targeted practice sets for Class 8 Science Chapter 16 Light. Built according to official educational guidelines for the 2026-27 academic year, these downloadable worksheets support daily revision and core concept reinforcement.
Practice Chapter 16 Light Worksheets for Class 8 Science
Navigate directly to the printable exercises for Chapter 16 Light using the digital viewer below. Each practice set allows students to isolate specific topics for thorough review and uninterrupted practice alongside standard textbooks.
A. Check Point: Refraction and Dispersion
1. Three transparent substances. 2. How does light travel from air to glass?
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Answer: 1. Glass, water and air. 2. Light slows down and bends towards the normal when it passes from air (rarer) to glass (denser).
Teacher's Note: Use the key term in your answer.
3. Two examples of refraction in daily life. 6. Why does a straight rod look bent in water? 7. Why does a coin appear raised in water?
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Answer: 3. A pencil in a glass of water looks bent, and a swimming pool looks shallower than it really is. 6 and 7. Light from the part of the rod (or the coin) under water bends away from the normal when it goes from water to air, so the object appears to be at a different, higher position.
Teacher's Note: Give an example if the question allows.
4. The colours of the spectrum in order. 5. Who discovered that light has seven colours?
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Answer: 4. Violet, indigo, blue, green, yellow, orange and red (VIBGYOR). 5. Sir Isaac Newton.
Teacher's Note: Write a short, clear answer.
8. Explain Newton's colour disc. Which colour is seen when it is spun fast?
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Answer: Newton's disc is a circular card painted with the seven colours in sectors. When it is rotated rapidly the colours mix in our eye, and it appears white (or whitish-grey).
Teacher's Note: Remember this for your exam.
9. What is refraction? 10. Does refraction happen in the same medium or different media?
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Answer: Refraction is the bending of light when it passes from one transparent medium to another. It usually happens at the boundary of different media, though light also bends in one medium whose density varies, for example the hot air above a fire.
Teacher's Note: Learn this point and write it in your own words.
11. Draw the dispersion of white light through a prism.
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Answer: A narrow beam of white light entering a glass prism splits into seven colours, with violet bending the most and red the least.
Teacher's Note: See the diagram below.
B. Spherical Mirrors
1. How many types of curved mirror are there?
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Answer: Two: the concave mirror (reflecting surface curved inwards) and the convex mirror (reflecting surface curved outwards).
Teacher's Note: Give an example if the question allows.
2. Key concepts for image formation.
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Answer: Pole (P): the centre of the mirror surface. Principal axis: the line through the pole and the centre of curvature. Centre of curvature (C): the centre of the sphere of which the mirror is a part. Radius of curvature: the distance PC. Principal focus (F): the point where rays parallel to the axis meet (or seem to meet). Focal length: the distance PF, equal to half of the radius of curvature.
Teacher's Note: Write a short, clear answer.
3. Difference between concave and convex mirrors.
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Answer:
| Concave | Convex |
|---|---|
| Reflecting surface curves inwards | Reflecting surface curves outwards |
| Converging mirror | Diverging mirror |
| Forms real and virtual images | Forms only virtual, upright, smaller images |
| Used in shaving mirrors, torches and headlights | Used as rear-view mirrors in vehicles |
Teacher's Note: Remember this for your exam.
4. Uses of concave and convex mirrors.
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Answer: Concave: shaving and make-up mirrors, doctor's head mirror, torches and headlights, solar cookers. Convex: rear-view mirrors of vehicles and street-corner safety mirrors, because they show a wider area.
Teacher's Note: Learn this point and write it in your own words.
11. C1. How is the image formed when the object is (a) beyond C (b) at C (c) between C and F (d) at F (e) in front of F (concave mirror)?
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Answer:
| Object position | Image |
|---|---|
| (a) Beyond C | Between C and F, real, inverted, smaller |
| (b) At C | At C, real, inverted, same size |
| (c) Between C and F | Beyond C, real, inverted, larger |
| (d) At F | At infinity, real, inverted, very large (no image on a screen nearby) |
| (e) Between F and the pole | Behind the mirror, virtual, upright, larger |
Teacher's Note: Use the key term in your answer.
C. Keywords
12. Define: refraction, concave mirror, convex mirror, principal axis, pole, centre of curvature, radius of curvature, focus, focal length, real image, virtual image, dispersion, spectrum.
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Answer: Refraction: bending of light at a boundary. Concave mirror: a mirror curved inwards. Convex mirror: curved outwards. Principal axis: the line through the pole and the centre of curvature. Pole: the centre of the mirror's surface. Centre of curvature: the centre of the sphere of which the mirror is a part. Radius of curvature: distance from the pole to the centre of curvature. Focus: the point where parallel rays meet after reflection. Focal length: the distance from the pole to the focus. Real image: an image that can be taken on a screen. Virtual image: one that cannot be taken on a screen. Dispersion: splitting of white light into its colours. Spectrum: the band of colours formed.
Teacher's Note: Give an example if the question allows.
D. Exercise
(i) The image is upright and magnified. (ii) The image is inverted, equal in size, at C. (iii) The image is inverted, bigger, beyond C. (v) A convex mirror is used in. (vi) The point where the principal axis touches the mirror. (viii) Convex mirrors form only ____ images. (ix) Who showed that white light has seven colours. (x) White light has ____ colours.
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Answer: (i) (b) In front of F; (ii) (d) At C; (iii) (c) Between C and F; (v) (b) Mirror of a vehicle; (vi) (b) Pole; (viii) (b) virtual; (ix) (a) Sir Isaac Newton; (x) (b) seven.
Teacher's Note: Write a short, clear answer.
14. Fill in the blanks: 1. White light splitting into a band of seven colours on a screen is a ____. 2. An image that can be taken on a screen is a ____ image. 3. One that cannot is a ____ image. 4. Splitting of white light is called ____. 5. Light that falls on an object and bounces off is ____. 6. ____ happens when light passes from one transparent medium to another. 7. A ____ is the result of dispersion by water drops. 8. A ____ diagram shows the size, location and type of image. 9. A ____ mirror shows a larger area than a plane mirror. 10. A ____ image of a concave mirror can be captured on a screen.
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Answer: 1. spectrum; 2. real; 3. virtual; 4. dispersion; 5. reflection; 6. Refraction; 7. rainbow; 8. ray; 9. convex; 10. real.
Teacher's Note: Remember this for your exam.
15. True or False: 1. Refraction cannot take place in the same medium if the densities of layers vary. 2. We can see an image on a curved surface too. 3. The outer surface of a spoon is the concave surface. 4. The point equidistant from all points of the mirror surface is the radius of curvature. 5. A convex mirror can project an image that is not real. 6. A virtual image can be captured on a screen. 8. A convex mirror always gives a virtual, upright, smaller image behind the mirror. 9. A ray diagram needs the images of the upper and lower end of the object. 10. Doctors use convex mirrors to produce a parallel beam of light.
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Answer: 1. False; 2. True; 3. False (it is the convex surface); 4. False (it is the centre of curvature); 5. False; 6. False; 8. True; 9. True; 10. False (they use concave mirrors).
Teacher's Note: Learn this point and write it in your own words.
16. E1. Explain refraction. E2. Note on a spherical mirror. E4. What are the spectrum and dispersion? E5. Real and virtual images. E6. Recomposition of white light.
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Answer: Refraction: bending of light as it goes from one medium into another. Spherical mirror: a mirror whose reflecting surface is part of a hollow sphere, concave or convex. Dispersion is the splitting of white light into seven colours by a prism; the band of colours is the spectrum. Real images are formed where rays actually meet, and can be taken on a screen; virtual images are formed where rays only seem to meet, and cannot. Recomposition: when the seven colours are passed through a second inverted prism, or Newton's disc is spun, they join to give white light again.
Teacher's Note: Use the key term in your answer.
17. E3. The rules for drawing a ray diagram of a spherical mirror.
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Answer: (1) A ray parallel to the principal axis passes through the focus after reflection (concave). (2) A ray through the focus becomes parallel to the axis. (3) A ray through the centre of curvature comes back along the same path. (4) A ray at the pole is reflected at the same angle on the other side of the axis. Two rays meeting give the image of the tip of the object.
Teacher's Note: Give an example if the question allows.
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FAQs
You can download the teacher-verified PDF for CBSE Class 8 Science Light Worksheet Set 06 from StudiesToday.com. These practice sheets for Class 8 Science are designed as per the latest CBSE academic session.
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