A thin prism $P_1$ of angle 4${}^{\circ }$ and refractive index 1.54 is combined with another thin prism $P_2$ of refractive index 1.72 to produce dispersion without deviation. The angle of $P_2$ is :

Q. A thin prism $P_1$ with angle $4^{\circ }$ and made from glass of refractive index 1.54 is combined with another prism $P_2$Made of glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism $P_2$ is

Q. A thin prism $P_1$, with angle $4^{\circ }$ and made from glass of refractive index $1.54$ is combined with another thin prism $P_2$ made from glass of refractive index $1.72$ to produce dispersion without deviation. The angle of the prism $P_2$ is

Q. A thin prism P1 with angle 4⁰ and made from a glass of refractive index 1.54 is combined with another prism P2 made from glass of refractive index 1.72 to produce dispersion withiutdeviation . The angle of prism P2 is:-
5.33⁰/4⁰/3⁰/1.6⁰