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

Options

A. `hat(i)xxhat(n)=mu(hat(n )xxhat(r))`
B. `hat(i)xxhat(n)=mu(hat(n) xxhat(r))`
C. `hat(i)xxhat(n)=mu(hat(r) xxhat(n))`
D. `mu(hat(i)xxhat(n))=hat(r )xxhat(n)`

Answer

C

Explanation

`hat(i)xxhat(n)=|hat(i)||hat(n)|sini,``hat(r)xxhat(n)=|hat(r)||hat(n)|sinr`