Refraction Through a Prism

A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to ${\frac{3}{4}}^{\mathrm{th}}$ of the angle of the prism. The angle of deviation is 

If the yellow light is refracted by a prism at an angle of minimum deviation then-

A ray passes through an equilateral glass prism such that $\mathrm{i}=\mathrm{e},$ which is $3/4$ of the prism angle. Then deviation will be -

The graph is plotted between the angle of deviation $\left(\delta \right)$ and angle of incidence $\left(i\right)$ for a triangular prism is represented by which of the following:

A ray of light strikes a plane mirror at an angle of incidence ${45}^{\mathrm{o}}$ as shown in the figure. After reflection, the ray passes through a prism of refractive index 1.50, whose apex angle is $4^{\mathrm{o}}$ . The angle through which the mirror should be rotated if the total deviation of the ray is to be ${90}^{\mathrm{o}}$ is.