If hat(i) denotes a unit vector along in...

If `hat(i)` denotes a unit vector along incident light ray, `hat( r)` a unit vector along refracted ray into a medium of refractive index `mu` and `hat(n)` unit vector normal to boundary of medium directed towards incident medium, then law of refraction is

`hat(i).hat(n) = mu(hat(r)hat(n))`

`hat(i)xxhat(n) = mu(hat(n)xxhat(r))`

`hat(i)xxhat(n) = mu(hat(r)xxhat(n))`

`mu(hat(i)xxhat(n)) = hat(r)xxhat(n)`

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