Optics Question 973

Question: A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of 45°. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value (s) of n from the following

[IIT-JEE 1998]

Options:

A) 1.3

B) 1.4

C) 1.5

D) 1.6

Show Answer

Answer:

Correct Answer: D

Solution:

For TIR i > C

Therefore sin i > sin C

Therefore $ \sin 45{}^\circ >\frac{1}{n} $

Therefore $ n>\sqrt{2} $

Therefore n > 1.4



NCERT Chapter Video Solution

Dual Pane