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September 1, 2015

Homework Help: physics

Posted by steph on Saturday, September 14, 2013 at 2:43pm.

A lightbulb emits light that creates a shadow of a ball on a wall. If the radius of the ball is 12.3 cm, and the radius of the shadow is 29.5 cm, and the ball is 1.27 m away from the wall, how far is the lightbulb away from the wall? (For the present problem, you may assume that the light bulb is a"point source".)

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