a lantern gives an image of 3m square of a solid 7.62cm square on a...
a lantern gives an image of 3m square of a solid 7.62cm square on a...
a lantern gives an image of 3m square of a solid 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?
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Asked by Shalomsung on 26th June, 2020
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