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A parallel beam of light is focussed by the use of a convex lens on a wall. When sharp image is obtained,
what is the distance between the lens and the wall in terms of focal length of the lens?
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Answer:
It will be exactly equal to the focal length of the convex lens.
Explanation:
when parallel beam of light focused by a convex lens, the image forms at the focal plane of the convex lens. When the image is obtained on a screen, the distance will be equal to the focal length of the convex lens that is used.
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