Young's double slit experiment is conducted in a liquid of refractive index `mu_1` as shown in figure. A thin transparent slab of refractive index `mu_2` is placed in front of the slit `s_2`. The magnitude of optical path difference at 'O' is

Options

A. `|((mu_(2))/(mu_(1)) - 1)t|`
B. `|((mu_(1))/(mu_(2)) - 1)t|`
C. `|(mu_(2) - mu_(1)) t|`
D. `|(mu_(2) - 1) t|`

Answer

a

Explanation

Optical path difference at `O = ((mu_(2))/(mu_(1)) - 1)t`