A boy 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 $ \times $ 109 m and its mean distance from the earth is 1.5 $ \times $ 1011 m. What is the diameter of the sun's image on the paper ?

Question

A boy 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 $ \times $ 10⁹ m and its mean distance from the earth is 1.5 $ \times $ 10¹¹ m. What is the diameter of the sun's image on the paper ?

6.5 $ \times $10^$-$5 m

12.4 $ \times $10^$-$4 m

9.2 $ \times $10^$-$4 m

6.5 $ \times $10^$-$4 m

Solution

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