A camper is trying to start a fire by focusing sunlight, Physics

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A camper is trying to start a fire by focusing sunlight

A camper is trying to start a fire by focusing sunlight onto apiece of paper. The diameter of the sun is 1.39 x10⁹ m, and its mean distance from the earth is 1.50x 10¹¹m. The camper is using a converging lenswhose focal length is 10.3 cm. (a) Whatis the area of the sun's image on thepaper? (b) If 0.618 W of sunlight pass through the lens, what is the intensity of the sunlight at the paper?

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