Question

A thin prism P1 with angle 4 ∘ and made from glass of refractive index 1.54 is combined with another prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation. the angle of prism P2 is
a . 2.3
b . 4.3
c . 3.2
d . 2.0

Answer 1

Hence, the answer is 3.2