A rectangular slab of glass of refractive index 1.5 is immersed in water of refractive index 1.33 such that the top surface of the slab remains parallel to water level. Light from a point source in air is incident on the surface of water at an angle $$\alpha$$ such that the light reflected from the glass slab is plane polarised, the angle $$\alpha$$ is

A

$$84.4^\circ$$

B

$$48.4^\circ$$

C

$$56.3^\circ$$

D

$$53.1^\circ$$