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Answer to Question #84770 in Optics for Sarah Rahmani
Question #84770
A group of students wanted to watch the solar eclipse, but were unable to get eclipse glasses. They decided to build a pinhole projector out of a cardboard box. They would like the image of the sun to be at least 2 cm in diameter. If the pinhole is on one end of the box, and the screen on the other, how long should the box be? Enter the answer in meters.
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Comments
The box size (d) should be: d=(h/H)*D ,where h is diameter of image in camera, H is the sun's diameter and D is distance from the sun. By knowing H,D and since h=0.02 m then d=2.16 m approx.
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