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A lantern gives an image of 3m square of a slide 7.62cm square on a...

A lantern gives an image of 3m square of a slide 7.62cm square on a screen. If the screen is 10m from the projection lens of the lantern calculate the focal length of the lens?
In Physics
4 Answers Available
Asked by FamDamSam on 5th July, 2014
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