A thin prism P_1 with an angle 6^ and made of glass of refractive index 1.54 is combined with another prism P _2 made from glass of refractive index 1.72 to produce dispersion without average deviation. The angle of prism P _2 is :

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Correct answer: D. 4.5^

Angle of deviation for first prism _1=A_1 ( _1-1 )=6(1.54-1) Angle of deviation for second prism aligned & _2=A_2 ( _2-1 ) \ & =A_2(1.72-1) aligned For dispersion without deviation aligned & _1= _2 \ & 6^ (1.54-1)= A _2(1.72-1) \ & A _2= 6^ 0.54 0.72 = 18^ 4 =4.5^ aligned

BITSAT Physics Question (2023) — Solution

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