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A ray of light incident normally on the ...

A ray of light incident normally on the first face of a glass prism of refractive index 1.6 just emerges from the other face. Find the angle of the prism.

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`n _(g) = 1.6`
At the first face,
Angle of incidence `I _(0) = 0`
angle of refraction `r _(1) =0`
At the second face,
Angle of incidence ` r _(2) = C = ?`
Angle of refraction `i_(2) = 90^(@)`
We have for critical incidence at the second face
`n = (1)/( sin C) implies sin C = (1)/(n) = (1)/(1.6) = 0. 6250`
`C = 38^(@)41.`
We have `A = r _(1) + r _() = 0 + C = 38^(@) 41.`
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