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Convex Lens

The focal len...

Question

The focal length of a convex lens is $5 c m$ ,where should the object be placed to get a real image with same size as that of object:

A

10 c m

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B

15 c m

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C

60 c m

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D

N o n e o f t h e s e

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Solution

The correct option is A $10 c m$
A same sized, real and inverted image is formed when object is placed at centre of curvature. So the required distance is the radius of curvature(R) of the lens.
R=2f
=2*5= 10 cm

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