Question

16. When an unpolarized beam of light is incident on a dielectric at the
polarizing angle, then the reflected beam is
(A) Circularly polarized
(B) Elliptically polarized
(C) Still unpolarized V
(D) Plane polarized​

Answer 1

The Reflected beam is 100% polarised when incident on a dielectric at a polarizing angle.

Explanation:

• When unpolarized light is incident on a dielectric at a polarizing angle which is also called Brewster's angle, the reflected light from the surface is plane polarized.
• The reflected ray is 100% polarized.
• On passing the unpolarized light through the polarizer, the intensity of the light becomes half. Due to which it is completely polarized.
• The electric field vector is ossicilating perpendicular to the alignment of the molecules.