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

Explanation

refactive index of glass `mu =1.5 `
Brewster angle `=theta `
Brewster angle if related index as :
`tan theta =mu `
`theta =tan ^(-1) (1.5 )=56.31^(@)`
therefore , the brewstar angle for air t glass transition is `56.31^(@)`.