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A ray of light is incident normally on o...

A ray of light is incident normally on one of the faces of a prism of apex angle 30 degree and refractive index `sqrt2`. The angle of deviation of the ray in degrees is

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Apply Snell.s law of refraction at P `(sin 30^@)/(sin r)=1/sqrt2`
`or sin r=sqrt2 times 1/2=1/sqrt2 = sin 45^@ or r=45^@`
`therefore delta=r-30^@=45^@-30^@=15^@, therefore`Deviation of ray=`15^@`
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