Consider an equilateral prism (refractive index $ \sqrt{2} $). $A$ ray of light is incident on its one surface at a certain angle $ i $. If the emergent ray is found to graze along the other surface, then the angle of refraction at the incident surface is close to . . . . . . . (in $^{\circ}$)

$A$ prism has a refracting angle $A$. The second refracting surface of the prism is silvered. $A$ light ray falling on the first refracting surface with an angle of incidence $2A$ reaches the second surface and returns back along the same path due to reflection at the silvered surface. The refractive index of the material of the prism is:

$A$ yellow light undergoes minimum deviation through a prism. If $i_1$ and $i_2$ are the angle of incidence and the angle of emergence respectively,then:

For a prism,the angle of the prism is $60^{\circ}$ and the refractive index is $\sqrt{7/3}$. The minimum possible angle of incidence so that the light ray is refracted from the second surface is (in $^{\circ}$)

$A$ ray of light is incident at an angle of $60^o$ on one face of a prism of angle $30^o$. The emergent ray of light makes an angle of $30^o$ with the incident ray. The angle made by the emergent ray with the second face of the prism will be....$^o$

An achromatic prism is made by a crown glass prism $(A_C = 19^o)$ and a flint glass prism $(A_F = 6^o)$. If the refractive indices for violet light are $\mu_{v,C} = 1.5$ and $\mu_{v,F} = 1.66$,then the resultant deviation for the red-coloured ray will be......$^o$