# I What happens if the angle < Brewster's angle?

1. Nov 15, 2016

### garylau

Sorry
i have question for TM polarization.
i dont understand why if the angle < brewster's angle,then the reflected light will experience an pi phase shift?
can anybody explain why?

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2. Nov 15, 2016

### blue_leaf77

Take a look at these equations, especially $r_p$ which is the (complex) reflection coefficient for TM polarization. In particular, you will be interested in the so-called internal reflection, that is when $n_2 < n_1$.