In Young's double-slit experiment, the y-coordinate of central maxima and 10th maxima are 2 cm and 5 cm, respectively, When the YDSE apparatus is immersed in a liquid of refreactive index 1.5, the corresponding y-coordinates will be

Options

A. (a) `2cm`, `7.5cm`
B. (b) `3cm`, `6cm`
C. (c) `2cm`, `4cm`
D. (d) `4//3cm`, `10//3cm`

Answer

C

Explanation

Fringe with `betaproplambda`. Therefore, `lambda` and hence `beta` decreases 1.5 times when immersed in liquid. The distance between central maxima and `10^(th)` maxima is 3cm in vacuum. When immersed in liquid it will reduce to `2cm`. Position of central maxima will not chagne while 10th maxima will be obtained at `y=4cm`.