Question

At what distance from a Convex lens of focal length 2.5 m should Rohan stand so that his image is half his height

Answer 1

Explanation:

The image of Mohan will only be half of it's height if he stands at the centre of curvature ..

given

focal length=2.5 m

radius of curvature = f×2

=2.5×2

=5 m

Thus he should stand at a distance of 5 m ..

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