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Q.7. State two differences between a convex and, a concave lens., , , , , , , , Convex lens Concave lens, (i) Convex lens can form both || (i) Concave lens always forms, real and virtual images. a virtual image., (i) It can form magnified image.| (ii) Image is always diminished in size.

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Q.8. Give one use each of a concave and a, convex mirror., , Ans. Use of concave mirror:, , Concave mirror is used by dentists to examine the, teeth., , Use of convex mirror:, , Convex mirror is used as side view mirror in, vehicles, , Q.9. Which type of mirror can form a real image?, Ans. Concave mirror can form a real image., , Q.10. Which type of lens forms always a virtual, image?, , Ans. Concave lens always forms a virtual image., , Choose the correct option in Questions 11-13:

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Q.11. A virtual image larger than the object can, be produced by a, , (i) concave lens (ii) concave mirror (iii) convex, mirror (iv) plane mirror, , Ans. (ii) concave mirror, , Q.12. David is observing his image in a plane, mirror. Die distance between the mirror and his, image is 4 m. If he moves 1 m towards the mirror,, then the distance between David and his image, , will be, (i) 3 m (ii) 5 m (iii) 6 m (iv) 8m, , Ans. (iii) 6m

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Q.13. The rear view mirror of a car is a plane, mirror. A driver is reversing his car at a speed of 2, m/s. The driver sees in his rear mew mirror the, image of a truck parked behind his car. The, speed at which the image of the truck appears to, approach the driver will be, , (i) 1 m/s (ii) 2 m/s (iii) 4 m/s {iv) 8 m/s, , Ans. (ii) 4 m/s