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 refractive index 1.5, the corresponding y-coordinates will be

Options

A. 2 cm, 7.5 cm
B. 3 cm, 6 cm
C. 2 cm, 4 cm
D. `4//3 cm`, 103 cm

Answer

c

Explanation

Fringe width, `beta porp lambda`. Therefore, `lambda` and hence `beta` will decrease 1.5 times when immersed in the liquid. The distance between central maxima and 10th maxima is 3 cm in vacuum. When immersed in the liquid, it will reduce to 2 cm. Position of central maixma will not change while 10th maxima will be obatined at `y = 4 cm`.