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Manu observes that the image of a candle flame placed at a distance of 30 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of 60 cm from the optical centre of the lens. Few questions came to her mind.1. What is the type of the lens?a. Convex lensb. Concave lensc. Bifocal lensd. Plane lens2. What is the focal length of the lens?a. 10 cmb. 15 cmc. 20 cmd. 25 cm3. If the height of the flame is 3 cm, find the height of its image.a. -1 cmb. -2 cmc. -6 cmd. None of these4. What is the magnification of convex lens?a. -1b. -2c. -3d. -45. Focal length of convex lens isa. Negativeb. Positive |
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Answer» 1. a. Convex lens 2. c. 20 cm 3. c. - 6 cm 4. b. -2 5. b. Positive |
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