Question

At what incident angle, with respect to the normal to the interface, is light inside the crown glass completely polarized when reflected from water

Answer 1

57°

Step-by-step explanation:

Etienne Malus discovered the idea of polarization by reflection. If light is incident on a surface at an angle of 57°, the reflected ray is found to be plane polarized.

Hence, with respect to the normal to the interface, light incident at 57° is completely polarized.