Question

Determine the minimum angle of incidence for light traveling in flint glass in order to undergo total internal reflection from carbon disulfide. The indices of refraction respectively for flint glass and carbon disulfide are 1.66 and 1.63.

°

Answer 1

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The minimum angle of incidence for the light to undergo total internal reflection is critical angle.

n2 c = sin-1 ni

As the ray passes from flint glass (medium 1 with   n1 =1.66 ) to carbon disulfide (medium 2 with   n2 = 1.63)

  

n2 c = sin-1 ni

= sin ^-1 (1.63/1.66) = 79.09 ^o

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