If i denotes a unit vector along incident light ray, r a unit vec… - Vidyadip

MCQ

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

A
$\hat i\,.\,\hat n = \mu (\hat r\,.\,\hat n)$
B
$\hat i \times \hat n = \mu (\hat n \times \hat r)$
✓
$\hat i \times \hat n = \mu (\hat r \times \hat n)$
D
$\mu (\hat i \times \hat n) = \hat r \times \hat n$

✓

Answer

Correct option: C.

$\hat i \times \hat n = \mu (\hat r \times \hat n)$

c
(c) Snell’s law in vector form is $\hat i \times \hat n = \mu (\hat r \times \hat n)$

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