A man is trying to start a fire by focusing sunlight on a piece of paper using an…
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
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 × 109 m and its mean distance from the earth is 1.5 × 1011 m, the diameter of the sun’s image on the paper is
- 3.1 × 10–4 m
- 6.5 × 10–5 m
- 6.5 × 10–4 m
- 9.2 × 10–4 m
Answer
(D) 9.2 × 10 –4 m
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