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
Explanation
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Discussions (6)
The correct answer is "D" because for total internal refraction to occur,light rays must travel from optically denser medium to optically less dense medium and not form less dense medium to denser medium.
When light passes from an optically rarer medium to an optically denser medium, the light bends away from the normal
So the answer is D
The correct answer is "c" because for total internal refraction to occur,light rays must travel from optically denser medium to optically less dense medium and not form less dense medium to denser medium.
