A ray PQ is incident normally on the face AB of a triangular prism of refracting angle of `60^(@)`, made of a transparent material of refractive index `2/sqrt(3)`, as shown in the figure. Trace the path of the ray as it passes through the prism. Also calculate the angle of emergence and angle of deviation.

Explanation

`mu=(2)/(sqrt3)`
`sinC=(1)/(mu)`
`sinC=(sqrt3)/(2)rArr C=60^(@)`
On face AC, angle of incidence `=60^(@)`
which is equal to critical angle. Therefore, the refracted ray will go along AC as shown in figure.

`"Angle of emergence "=90^(@)`
`"Angle of deviation"=30^(@)`