Question

Which of the following is a necessary condition for total internal reflection?

• A. The angle of incidence in the denser medium must be greater than the critical angle for the two media
• B. The angle of incidence in the rarer medium must be greater than the critical angle for the two media
• C. The angle of incidence in the denser medium must be lesser than the critical angle for the two media
• D. The angle of reflection in the denser medium must be greater than the critical angle for the two media

Hint:

Total internal reflection occurs when the angle of incidence in the denser medium exceeds the critical angle.

Answer 1

The Correct Option is A

Step 1: Condition for total internal reflection.
Total internal reflection occurs when light passes from a denser medium to a rarer medium, and the angle of incidence in the denser medium exceeds the critical angle.

Step 2: Critical angle.
The critical angle is the angle of incidence beyond which the light cannot pass into the rarer medium but is entirely reflected back into the denser medium.