A beam of light is incident on a glass plate at an angle of 6 0 ∘ . The reflected ray is polarized. If angle of incidence is 4 5 ∘ then angle of refraction is

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According to Brewster's law, ∴ ​ tan θ B ​ = n tan 6 0 ∘ = n ​ ∴ ∴ ∴ ∴ ∴ ​ n = 3 ​ Now, s i n r s i n i ​ = n sin r = n s i n i ​ sin r = 3 ​ s i n 4 5 ∘ ​ sin r = 6 ​ 1 ​ r = sin − 1 ( 6 ​ 1 ​ ) . … ( ∵ sin 4 5 ∘ = 2 ​ 1 ​ ) ​

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