$A$ cut diamond sparkles because of its

$A$ light ray travels from a medium with refractive index $n_1$ to another medium of refractive index $n_2$. If $n_1=2$ and $n_2=\sqrt{3}$,then find the critical angle. (in $^{\circ}$)

$A$ green light is incident from the water to the air-water interface at the critical angle $(\theta)$. Select the correct statement.

$A$ small bulb is placed at the bottom of a tank containing water to a depth of $80 \, cm$. What is the area of the surface of water through which light from the bulb can emerge out? The refractive index of water is $1.33$. (Consider the bulb to be a point source.)

$A$ beam of light consisting of red,green,and blue colors is incident on a right-angled prism as shown. The refractive indices of the material of the prism for red,green,and blue wavelengths are $1.39, 1.44$,and $1.47$ respectively. The prism will:

Light enters an isosceles right triangular prism at normal incidence through face $AB$ and undergoes total internal reflection at face $BC$ as shown below. The minimum value of the refractive index of the prism is close to