What is the intensity of the sunlight at the paper

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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 1011 m. 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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