Question
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