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A thin lens of focal length `+10.0 cm` lies on a horizontal plane mirror. How far above the lens should an object be be held if its image is to coinci

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A thin lens of focal length `+10.0 cm` lies on a horizontal plane mirror. How far above the lens should an object be be held if its image is to coincide with the object?
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Correct Answer - A::C
If an object is placed at focus of lens `(=10 cm),`
rays becomes parallel and fall normal on plane
mirror. So, rays retrace their path.
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