Question

A convex lens of focal length 20 cm is cut long its diameter and the two halves are disp

Answer 1

when the convex lens is cut along its diameter there is no change in the focal length of the convex lens.

Explanation:

• however the luminous intensity of the image which is formed by the convex mirror decreases. The luminous intensity is directly proportional to the square  of the area of the the mirror. If we cut the convex lens along the diameter and separate the two halves then the effective area will decrease.

• And hence the luminous intensity of the convex  lens will become one fourth

To know more,

The radii of curvature of two surfaces of a convex lens are 0.2m and ...

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