Which of the following is not involved in Rainbow formation?

Options

A. Refraction
B. Internal reflection
C. Angular deviation
D. Dispersion

Answer

To determine which of the following is not involved in rainbow formation, we need to understand the processes that contribute to the formation of a rainbow. The key phenomena involved in rainbow formation are:

1. **Refraction**: This is the bending of light as it passes from one medium (air) into another (water droplets). When sunlight enters a water droplet, it slows down and bends.

2. **Dispersion**: This occurs when the different wavelengths (colors) of light are separated as they pass through the water droplet. Each color bends at a slightly different angle, leading to the formation of a spectrum.

3. **Total Internal Reflection**: After dispersion, the light reflects off the inside surface of the droplet. This reflection allows the light to exit the droplet at a specific angle, contributing to the visibility of the rainbow.

4. **Refraction upon exiting**: As the light exits the droplet, it bends again, further separating the colors and enhancing the visibility of the rainbow.

Now, let's analyze the options given in the question. We are looking for a phenomenon that is not involved in the formation of a rainbow.

**Step-by-Step Solution:**

1. **Identify the key processes involved in rainbow formation**: Refraction, dispersion, and total internal reflection are the primary processes involved.

2. **Consider the options provided**: The question likely presents several phenomena, and we need to identify which one does not play a role in rainbow formation.

3. **Eliminate the processes that are involved**: Since we know that refraction, dispersion, and total internal reflection are involved, we can eliminate these options.

4. **Identify the incorrect option**: If one of the options refers to angular deviation or any other phenomenon that does not contribute to rainbow formation, that would be the correct answer.

5. **Conclude the answer**: Based on the explanation, the phenomenon that is not involved in rainbow formation is **angular deviation**.

**Final Answer**: Angular deviation is not involved in rainbow formation.

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