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A plane wavefront is incident from air (...

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

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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^@)/(sin r)=3/2`
`sinr=2/3 times 3/5=2/5`
`r=sin^-1(2/5)` which is same angle of refractive wavefront with horizontal.
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