The light on the ceiling is 3.375m above the ground. When a thin lens is placed 25cm...

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Physics

Thelight on the ceiling is 3.375m above the ground. When a thin lensis placed 25cm above the ground, a minified image of the light fromthe ceiling is formed on the ground. What is the primary focallength of the thin lens? If the image of the light formed is 8cm x2.5cm in size, how large is the actual light?

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