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A plane wavefront is incident at an angl...

A plane wavefront is incident at an angle of `37^(@)` with horizontal a boundary of refractive medium from air `(mu=1)` to a medium of refractive index `mu=3/2`. Find the angle of refracted wavefront with horizontal

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It has been given that incident wavefront makes `37^(@)` with horizontal . Hence incident ray makes `37^(@)` with normal as the ray is perpendicular to the wavefront.
Now, by Snell's law
`(sin37^(@))/(sinr)=3/2`
`sin r=2/3xx3/5=2/5`
`r=sin^(-1)(2/5)`
Which is same as angle of refractive wavefront with horizontal.
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