Q.

A ray of light falls perpendicularly on the face of a right triangular prism as shown in the figure. If the total deviation suffered by the ray in degrees is δ. Find δ100 .  
(Refractive index of prism material is 5/3.  )
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answer is 1.27.

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Detailed Solution

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At point A
 μ sinθ > 1 Hence total internal reflection  will  take place 
At point B 
μsin θ1 = 1. Therefore light ray will graze the surface 
hence δ = 127°  
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