1. Explain translucent material. 2. Explain how the refractive index and dielectric constant determines the optical properties of the materials. 3. Define dispersion. 4. How one can say that a...

1. Explain translucent material.

2. Explain how the refractive index and dielectric constant determines the optical properties of the materials.

3. Define dispersion.

4. How one can say that a material is opaque?

5. Explain skin depth.

6. What is meant by traps?

7. What is meant by trapping centre?

8. Explain recombination process.

9. Define excitons.

10. What is meant by Frenkel excitons?

11. Explain Mott–Wannier excitons.

12. What is meant by colour centre?