In youngs double slit experiment, distance between the slits is d and that between the slits and screen is D. Angle between principal axis of lens and perpendicular disector of `S_(1)` and `S_(2)` is `45^(@)`. The point source S is placed at the focus of lens and aperture of lens is much larger then d. Assuming only the reflected light from plane mirror M is incident on slits, distance of central maxima from O will be :

Options

A. D
B. `(D)/(sqrt(3))`
C. `D sqrt(3)`
D. `(D)/(sqrt(4))`

Answer

A

Explanation

From the figure shown below it is clear that the distance of central maxima from O is D
.