A beam light travels from one medium into another medium without any deviation.

Question

A beam light travels from one medium into another medium without any deviation. This implies that (A) The first medium must be vacuum. (B) The second medium must be vacuum. (C) Both mediums are in liquid form. (D) The angle of incidence is 0 degree (E) The angle of incidence is 90 degree A ray light travels from a given medium into air (n_air = 1). It is determined that for any angle of incidence greater than alpha no ray emerges into air. The index of refraction of the given must be (A) sin alpha (B) 1/sin alpha (C) sin^-1 (alpha) (D) 1/sin^-1 (alpha) (E) sin(pi/2 - alpha)

Explanation / Answer

Angle of incidence is zero

(3). Required angle is critical angle(c)

We know c = sin^-1(1/n)

Sin c = 1/n

n= 1/sinc

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