Q. 1

A ray of light is

Answer :

Let angle of deviation = δ



Where,


i = angle of incidence


e = angle of reflection


A = angle of prism


We also define,


r1 = angle of refraction on incident face of prism


r1 = angle of refraction on incident face of prism


Given,


i = 0


so, r1 = 0


r2 = 600


critical angle = θ



Where μ = refractive index = 1.5




Since,



So there will be a total internal reflection,


The reflected ray is incident at the base at 90o


So the angle of emergence = e = 0


Now angle of deviation is calculated as




So


Or


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