List of top Physics Questions on Total Internal Reflection asked in CBSE Class XII

A small bulb is placed at the bottom of a tank, containing a transparent liquid of refractive index \(\sqrt{2}\), to a depth of \(1\,\text{m}\). Calculate the area of the surface of the liquid through which light from the bulb emerges.
In which of the following, total internal reflection does not occur ?
State the two conditions under which total internal reflection occurs.
A transparent container contains layers of three immiscible transparent liquids \(A\), \(B\) and \(C\) of refractive indices \(n\), \(\dfrac{3n}{4}\) and \(\dfrac{2n}{3}\), respectively. A laser beam is incident at the interface between \(A\) and \(B\) at an angle \(\theta\) as shown in the figure. Prove that the beam does not enter region \(C\) at all for \[ \sin\theta>\frac{2}{3}. \]
A ray of light is travelling through a rectangular glass slab (refractive index \(\frac{3}{2}\)) and is incident on the horizontal glass-air surface at the critical angle for the two media. The slab is then brought in contact with water (refractive index \(\frac{4}{3}\)) such that a thin horizontal layer of water is formed on the surface of the slab. Find the angle at which the ray will emerge into air from the water-air surface.
State the two conditions under which total internal reflection occurs.
A transparent container contains layers of three immiscible transparent liquids \(A\), \(B\) and \(C\) of refractive indices \(n\), \(\dfrac{3n}{4}\) and \(\dfrac{2n}{3}\), respectively. A laser beam is incident at the interface between \(A\) and \(B\) at an angle \(\theta\) as shown in the figure. Prove that the beam does not enter region \(C\) at all for \[ \sin\theta>\frac{2}{3}. \]
A ray of light is travelling through a rectangular glass slab (refractive index \(\frac{3}{2}\)) and is incident on the horizontal glass-air surface at the critical angle for the two media. The slab is then brought in contact with water (refractive index \(\frac{4}{3}\)) such that a thin horizontal layer of water is formed on the surface of the slab. Find the angle at which the ray will emerge into air from the water-air surface.