Question

the minimum sum of the distance between a real object and a real image of a concave mirror of radious of curvature of 20 cm is

Answer 1

Explanation:

When object is placed at center of curvature then image is formed at radius of curvature.

So the minimum distance is zero.

OR

Let focal length be f and and object is placed at u=2f

−f

1

=

v

1

+

u

1

=

v

1

+

−2f

1

v=−2f.

Image will form at object location.

So minimum distance is zero.

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