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Question: A thin convex lens & thin concave lens of focal length of magnitude f each are cut into two halves a...

A thin convex lens & thin concave lens of focal length of magnitude f each are cut into two halves and pasted together. If a coherent parallel beam of light is incident on the combination and intensity of incident light is I & focal length f = 2.25 l is same for both lens, then _

A

Total number of maxima excluding maxima at infinity is 10

B

Total number of maxima excluding maxima at infinity is 9

C

Intensity at point O is 4I

D

Intensity at point O is zero

Answer

Intensity at point O is zero

Explanation

Solution

There are two sources S1 & S2.

at point O minima will form

at infinity Dx = 0