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What is Brewster angle for air to glass ...

What is Brewster angle for air to glass transtion ? (`mu` of glass is `1.5`)

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Given, refractive index of glass, `mu = 1.5,`
Brewster angle , `theta = ?`
Since, `mu = tan theta`
`:. tan theta = 1.5`
or `theta = tan^(-1) 1.5 = 56.3^@`.
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