Physics - Geometrical Optics Question with Solution | TestHub

A thin prism ${\mathrm{P}}_1$ with angle $4^{\circ }$ and made from glass of refractive index $1\cdot 54$ is combined with another thin prism ${\mathrm{P}}_2$ made from glass of refractive index $1\cdot 72$ to produce dispersion without deviation. The angle of prism for ${\mathrm{P}}_2$ is