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GURUKUL CENTRAL ACADMY, CH.- 14- light, WORKSHEET-1 Refer text book, WORKSHEET-2 Refer text book, WORKSHEET-3 Refer text book, , TEXTBOOK EXERCISES, Page 178 Try These, 1. False, , 2. False, , 3. False 4. False 5. True, , EXERCISES, A. 1. c. 2. c. 3. d. 4. a. 5. c. 6. b. 7. c. 8. a. 9. b. 10. b., B. 1. rectilinear propagation of light 2. plane, 3. incident, 4. virtual images, 5. erect, virtual, 6. concave, convex, 7. Convex, 8. Spectrum, C. 1. False, D. 1. – b., , 2. True, 2. – c., , 3. True 4. False 5. False, 3. – d. 4. – e., , 5. – a.

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GURUKUL CENTRAL ACADMY, E. 1. Disagree, 2. Real, 3. No, 4. Concave, 5. Concave, 6. Concave mirror, 7. Concave mirror, 8. Convex mirror, 9. Convex lens, 10. Convex lens, 11. Concave mirror, 12. Regular, 13. Prism, 14. Dispersion of light, 15. Rectilinear propagation of light, F. 1. i. The image formed is virtual and erect., ii. The size of the image is equal to the size of the object., iii. The distance of the image behind the mirror is equal to the, distance of the object in front of the mirror., iv. The image formed is laterally inverted., 2., , 3., , When light falls on a surface, light bounces off the surface., This is called reflection of light. Smooth or polished surface., The inner side of the image is upright and larger in size when, surface is held close and as you move the surface away the, image becomes inverted and size also becomes small.

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GURUKUL CENTRAL ACADMY, 4., , 5., , Because they form images that are smaller in size, you get a, wider view., When the sun shines through water droplets in the air after it, rains, it gets split into its different colours. This is how a r, , G. 1. Refer Activity 1., 2., , i. Real Image:, 1. It can be taken on a screen., 2. It is erect., 3. Real image is formed when reflected rays intersect each, other., Virtual Image:, 1. It cannot be taken on a screen., 2. It is inverted., 3. A virtual image is formed when reflected rays seem to, meet at a point., ii., , Concave lens:, 1. A concave lens is thinner at the centre and thicker at the, edges., 2. It is also called diverging lens as it diverges all the, light rays which pass through it., Convex lens:, 1. A convex lens is thicker at the centre and thinner at the, edges.

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GURUKUL CENTRAL ACADMY, 2., , 3., , 4., , 5., , It is also called a covering lens as it converges all the, parallel rays falling on it to a point called the principal, focus., , Refer page 179., When a thin beam of light is allowed to pass through a, prism, a piece of transparent material bound by two, triangular and three rectangular surfaces. The beam splits, into its different colours. A spectrum can be obtained by, keeping a white screen (a white sheet of paper) behind the, prism., , Refer page 181., , H. a. inclined ray, b. reflected ray, c. angle of reflection