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A ray of light passes through an equilat...

A ray of light passes through an equilateral prism (refractive index 1.5) such that angle of incidence is equal to angle of emergence and the latter is equal to `3//4^(th)` of the angle of prism. The angle of deviation is

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`A = 60^(@), mu = 1.5 , i_(1) = i_(2) = (3)/(4)A = 45^(@), delta= ?`
`because A + delta = i_(1) + i_(2) " " therefore 60^(@) + delta = 45^(@) + 45^(@) implies delta = 90^(@) - 60^(@) = 30^(@)`
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