A ray of light from a denser medium strikes a rarer medium at an angle of incidence i. If the reflected and refracted rays are mutually perpendicular to each other then what is the value of critical angle ?

As shown in figure light P enters to slab at an angle 60° with normal and inside slab Q makes total internal reflection. Find minimum refractive index
of slab.

The speed of light in media M1 and M2 is
\[1.5\times 10^{8} m/s and 2.0\times 10^{8}\] respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is :-

If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is

A transparent solid cylindrical rod has a refractive index of 2/√3. It is surrounded by air.A light ray is incident at the mid-point of one end of the rod
as shown in the figure.

The incident angle θ for which the light ray grazes along the wall of the rod is

A point source of light is kept at a depth of h in water of refractive index 4/3. The radius of the circle at the surface of water through which light
emits is

Figure shows a mixture of blue, green and red coloured rays incident normally on a right angled prism. The critical angles of the material of the prism for red, green and blue are 46°, 44° and 43° respectively. The arrangement will separate.

A light ray travelling in a glass medium is incident on glass-air interface at an angle of incidence q. The reflected (R) and transmitted (T) intensities,
both as function of q, are plotted. The correct figure is :- {θc = critical angle}

A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid ?