Which one of the following is not associated with the total internal reflection?

Options

A. The mirage formation
B. optical fibre communication
C. Te glittering of diamond
D. Dispersion of light

Explanation

To determine which of the following options is not associated with total internal reflection, we will analyze each option one by one:

1. **Mirage Formation**:
- A mirage is an optical phenomenon that occurs due to the refraction and total internal reflection of light in layers of air with different temperatures (and thus different densities). When light travels from cooler air to warmer air, it bends and can reflect internally, creating the appearance of water on the ground. Therefore, mirage formation is associated with total internal reflection.

2. **Optical Fiber Communication**:
- Optical fibers consist of a core and cladding, where the core has a higher refractive index than the cladding. Light signals are transmitted through the core by total internal reflection, allowing for efficient communication with minimal loss of signal. Thus, optical fiber communication is also associated with total internal reflection.

3. **Glittering of Diamond**:
- Diamonds have a very high refractive index and a low critical angle. When light enters a diamond, it undergoes multiple total internal reflections within the diamond, contributing to its brilliance and sparkle. Therefore, the glittering of diamonds is associated with total internal reflection.

4. **Dispersion of Light**:
- Dispersion refers to the phenomenon where white light splits into its constituent colors when passing through a prism or other medium. This occurs due to different wavelengths of light being refracted by different amounts, not due to total internal reflection. Therefore, dispersion of light is not associated with total internal reflection.

**Conclusion**: The option that is not associated with total internal reflection is **Dispersion of Light**.

### Summary of Steps:
1. Analyze each option for its association with total internal reflection.
2. Confirm that mirage formation, optical fiber communication, and glittering of diamonds are all associated with total internal reflection.
3. Identify that dispersion of light does not involve total internal reflection.