NEET 2008 Physics 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 m and its mean distance from the earth is m. What is the diameter of the Sun's image on the paper?
Answer: (2)
Solution
The Sun is very far away, so its image forms at the focus (). By similar triangles through the optical centre, . $ = ⇒ d = =
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