The angle of minimum deviation for a prism is $40^o$ and the angle of the prism is $60^o$. The angle of incidence in this position will be.....$^o$

$A$ parallel beam of monochromatic light is incident at one surface of an equilateral prism. The angle of incidence is $55^o$ and the angle of emergence is $46^o$. The angle of minimum deviation will be:

$A$ prism has a refracting angle of $30^\circ$ and a refractive index of $\sqrt{2}$. One of its faces is silvered. At what angle of incidence $i$ should a ray be incident on the other face so that it retraces its path after reflection from the silvered face?

In the diagram,a ray is passing through a broken prism. Find the angular deviation for the ray. (in $^{\circ}$)

Monochromatic light of wavelength $6000 Å$ is incident on a small-angled prism. If the angle of the prism is $6^{\circ}$ and the refractive indices of the material of the prism for violet and red lights are $1.52$ and $1.48$ respectively, then the angle of dispersion produced for this incident light is: (in $^{\circ}$)

$A$ prism of refracting angle $60^\circ$ is made with a material of refractive index $\mu$. For a certain wavelength of light,the angle of minimum deviation is $30^\circ$. For this wavelength,the value of the refractive index of the material is: