A thin prism P₁ of angle 4^ and refractive index 1.54^ is combined with another thin prism P₂ of refractive index 1.72 to produce dispersion without deviation. The angle of P₂ is

Step-by-step solution

Angle of deviation =(n-1) A . Dispersion produced by both the prism's will be equal. aligned (n₁-1 ) A₁ & = (n₂-1 ) A₂ A₂= & (n₁-1 ) A₁ (n₂-1 ) = (1.54-1) (1.72-1) =3^ aligned Hence, the angle of prism P₂ is 3^ .