A secondary rainbow is formed when light rays coming from the Sun undergo the following through spherical water droplets

Options

A. A refraction internal reflection and then refraction
B. Two refractions only
C. A refraction internal reflection again internal reflection and then refraction
D. A refraction internal reflection and again internal reflection

Answer

To solve the question regarding the formation of a secondary rainbow when light rays from the Sun interact with spherical water droplets, we can break down the process into clear steps:

### Step-by-Step Solution:

1. **Incident Light**: Sunlight, which is composed of various colors (spectrum), enters the spherical water droplet.

**Hint**: Remember that sunlight is made up of different colors that can be separated through refraction.

2. **Refraction at Entry**: As the light rays enter the droplet, they undergo refraction. This bending of light occurs because light travels slower in water than in air, causing the light to change direction.

**Hint**: Think about how light bends when it moves from one medium to another.

3. **Dispersion of Light**: Due to the different wavelengths of light, each color bends by a different amount. This separation of colors is known as dispersion, resulting in a spectrum of colors inside the droplet.

**Hint**: Recall that shorter wavelengths (like violet) bend more than longer wavelengths (like red).

4. **Internal Reflection**: After dispersion, the light rays reflect off the inner surface of the droplet. In the case of a secondary rainbow, this involves total internal reflection (TIR) occurring twice.

**Hint**: Remember that TIR happens when the light hits the boundary at an angle greater than the critical angle.

5. **Refraction at Exit**: The light rays then exit the droplet. As they leave, they undergo refraction again, bending once more as they move from water back into air.

**Hint**: Consider how the light path changes again as it exits the droplet.

6. **Formation of the Secondary Rainbow**: The combination of these processes results in the formation of a secondary rainbow. The colors of the secondary rainbow are inverted compared to the primary rainbow, with red on the bottom and violet on the top.

**Hint**: Think about the order of colors in a rainbow and how they are affected by the internal processes in the droplet.

### Final Answer:
The correct sequence of events for the formation of a secondary rainbow is: Refraction, Internal Reflection, Internal Reflection, and then Refraction.

### Summary of Steps:
1. Incident Light
2. Refraction at Entry
3. Dispersion of Light
4. Internal Reflection (TIR twice)
5. Refraction at Exit
6. Formation of the Secondary Rainbow