question_answer

An unpolarized beam of light is incident on a glass surface at an angle of incidence equal to the polarizing angle of the glass. Read the following Statements:

(i) The reflected beam is completely polarized.

(ii) The refracted beam is partially polarized.

(iii) The angle between the reflected and the refracted beams is \[{{90}^{o}}\].

Which of the above statements is/are true?

A)  (i) only

B)  (ri) (ii)only

C)  (i) and (iii)

D)  All the statements are correct

Correct Answer: C

Solution :

According to the Brewsters theory the quantity of polarized light in reflected light depends upon angle of incidence. If angle of incidence is equal to a particular angle called polarizing angle \[({{i}_{p}})\] then reflected beam is completely polarized. Also, when light is incident at polarizing angle then reflected and refracted rays are mutually perpendicular, i.e.,                 \[{{i}_{p}}+r={{90}^{o}}\]. Here, \[{{i}_{p}}\] is angle of reflection, and r is angle of refraction.