Two glass prisms of refractive index $1.5$ and $1.6$ are kept in contact and a ray of light is incident on this combination of prism. The light emerges out of this combination un deviation The angle of prism of refractive index $1.6$ is $5^{\circ}$ What is angle of prism of the other prism.

Question

$(a)\;6^{\circ} \\ (b)\;5^{\circ} \\ (c)\;4^{\circ} \\ (d)\;3^{\circ}$