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8. A man is trying to start a fire by focusing sunlighton a piece of paper using an equiconvex lens of focallength 10 cm. The diameter of the sun is 1,39 x 10 mand its mean distance from the earth is 1.5 x 1011 m,the diameter of the sun's image on the paper is(a) 3.1 x 10-4 m(c) 6.5 x 10-4 m(b) 6.5 x 10-5 m(d) 9.2 x 104 m |
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Answer» 8. A man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is 1,39 x 10 m and its mean distance from the earth is 1.5 x 1011 m, the diameter of the sun's image on the paper is (a) 3.1 x 10-4 m (c) 6.5 x 10-4 m (b) 6.5 x 10-5 m (d) 9.2 x 104 m |
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