Which of the following conditions are necessary and suffi...
Which of the following conditions are necessary and sufficient for total internal reflection to take place at the boundary between two optical media?
I. Light is passing from optical denser medium to optically less dense medium
II. Light is passing from optically less dense medium to optically denser medium
III. Angle of incidence is greater than a certain critical value
IV. Angle of incidence is lesser than a certain critical value
I and II only
II only III only
III and IV only
I and III only
Correct answer is D
No explanation has been provided for this answer.