Q 12-09-105JEE MainJEE Main 2023 (30 Jan, Shift 2)Easy
A thin prism $P_1$ with an angle $6^\circ$ 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
Answer: (D) $4.5^\circ$
No net deviation: $(\mu_1-1)A_1=(\mu_2-1)A_2$.
$$A_2=\frac{0.54\times6^\circ}{0.72}=4.5^\circ$$
Solution by Sreeraj P, M.Sc Physics