An equilateral prism deviates a ray through 45 ° for two angles of incidence differing by 20 ° . The angles of incidence are :

Question

An equilateral prism deviates a ray through 45 ° for two angles of incidence differing by 20 ° . The angles of incidence are :, 60 ° and 40 °, 50 ° and 70 °, 62 ° 30 ' and 42 ° 30 ', 60 ° 30 ' and 40 ° 30 '

MARKS App · Accepted Answer

δ = i 1 + i 2 - A 4 5 ∘ = i 1 + i 2 - 6 0 ∘ i 1 + i 2 = 1 0 5 ∘ i 1 - i 2 = 2 0 ∘ or 2 i i = 1 2 5 ∘ i 1 = 6 2 ∘ 3 0 ′ , i 2 = 4 2 ∘ 3 0 ′

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