Which of the following prisms is used to see the infrared spectrum of light?

If the refractive index of a material of an equilateral prism is $\sqrt{3}$,then the angle of minimum deviation of the prism is......$^o$

$A$ ray of light suffers a minimum deviation when incident on an equilateral prism of refractive index $ \sqrt{2} $. The angle of incidence is (in $^{\circ}$)

White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact,what will be seen on the screen?

$A$ prism of angle $10^o$ and refractive index $n=1.602$ is combined with another prism of refractive index $n=1.500$ such that the net deviation produced is zero. What is the angle of the second prism?

Which colour has more speed in a glass prism? Blue or yellow?