JEE Main & Advanced
Physics
Ray Optics
Question Bank
Total Internal Reflection
question_answer
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]
A) 1.3
B) 1.4
C) 1.5
D) 1.6
Correct Answer:
D
Solution :
For TIR i > C Þ sin i > sin C Þ \[\sin 45{}^\circ >\frac{1}{n}\]Þ \[n>\sqrt{2}\] Þ n > 1.4