Dispersion of Light

Q. Question 29
Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.

Q.

A light ray enters a rectangular glass slab from air. At the first surface of refraction, $i$ is the angle of incidence and $r$ is the angle of refraction. Which of the following statements is correct?

1. $r=i$

2. $r<i$

3. $r>i$

4. Cannot be determined

Q. The cut-off wavelength $\left(in\mu m\right)$ of light that can be used for intrinsic excitation of a semiconductor material of bandgap $E_g=1.1eV$ is

Q. The pressures of the Varnas or caste system led to which of the following?

1. Widespread wars
2. Class wars
3. Bhakthi movement
4. Creation of new religions

Q. In an equilateral prism, if a ray is incident on the normal, the angle of the internally reflected ray deviates through .

1. ${90}^0$
2. ${30}^0$
3. ${60}^0$
4. ${45}^0$