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 refraction index `mu` and `hat (n)` unit vector normal to boundary of medium directed towards incident medium, then law of refraction is

`hati*hatn=mu(hatr*hatn)`

`hatixxhatn=mu(hatnxxhatr)`

`hatixxhatn=mu(hatrxxhatn)`

`mu(hatixxhatn)=hatrxxhatn`

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The correct Answer is:

Snell's law in vector form
`hatixxhatn=mu(hatrxxhatn)`

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