91影视

Angle of refraction,${胃}_r=32掳$

We use the formula for Brewster angle to find the refractive index of glass. The addition of Brewster angle and the angle of refraction is$\mathbf{90}\mathbf{掳}$.Using this concept, we can find the angle of refraction.

Formulae:

${胃}_B=ta{n}^{-1}\left(\frac{n_2}{n_1}\right)$

${胃}_B+{胃}_r=90掳$

The addition of Brewster angle and the angle of refraction is $90掳$, i.e.${胃}_B+{胃}_r=90掳$,

We have${胃}_r=32掳$.

Therefore,

$$\begin{gathered} {胃}_B+32掳=90掳 \\ {胃}_B=58掳路路路路路路\left(1\right) \end{gathered}$$

TheBrewster angle given by equation $33-49$is

${胃}_B=ta{n}^{-1}\left(\frac{n_2}{n_1}\right)$

If the incident and reflected rays travel in air, we can approximate$n_1$as unity and let$n$be the refractive index of the second medium. Then we have

$$\begin{gathered} {胃}_B=ta{n}^{-1}n \\ {n}_{glass}=tan{胃}_B \\ =tan58掳 \\ =1.60 \end{gathered}$$

Hence, the index of refraction of glass is 1.60.

As calculated in part a), from equation (1), we can say that the Brewster angle is$58掳$.

Hence, Brewster angle is$58掳$.