Question

To make the central fringe at the center`O` , mica sheet of refractive index `1.5` is introduced Choose the corect statement.

A. The thickness of sheet is `2(sqrt(2)-1)d` in front of `S_(1)`
B. The thickness of sheet is `(sqrt(2)+1)d` in front of `S_(2)`
C. The thickness of sheet is `(2sqrt(2)d-1)` in front of `S_(2)`
D. The thickness of sheet is `(2sqrt(2)-1)d` in front of `S_(1)`

Answer 1

Correct Answer - A
`sqrt(2)d-d=(mu-1)timpliest=2(sqrt(2)-1)d`