The speed of light in two media ‘1’ and ‘2’ are v1 and v2(>v 1 ) respectively. For a ray of light to undergo total internal reflection at the interface of these two media, it must be incident from :

(A) medium ‘1’ and at an angle greater than sin-1 (v1/v2)
(B) medium ‘1’ and at an angle greater than cos-1 (v1}/v2)
(C) medium ‘2’ and at an angle greater than sin-1 (v1}/v2})
(D) medium ‘2’ and at an angle greater than cos-1 (v1/v2)

Correct Answer : Option (A) medium ‘1’ and at an angle greater than sin-1 (v1/v2)

More Questions : Which one of the following correctly represents the change in wave characteristics (all in vacuum) from microwaves to X-rays in electromagnetic spectrum?

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