Optics Question 571
Question: When unpolarised light beam is incident from air onto glass (n = 1.5) at the polarising angle
[KCET 2005]
Options:
A) Reflected beam is polarised 100 percent
B) Reflected and refracted beams are partially polarised
C) The reason for (a) is that almost all the light is reflected
D) All of the above
Show Answer
Answer:
Correct Answer: A
Solution:
According to Brewster’s law, when a beam of ordinary light (i.e. unpolarised) is reflected from a transparent medium (like glass), the reflected light is completely plane polarised at certain angle of incidence called the angle of polarisation.
