When white light is passed through a prism, the color that deflect least is :

Options

A. Blue
B. Red
C. Orange
D. Purple

Explanation

To solve the question "When white light is passed through a prism, the color that deflects least is:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding White Light**: White light is made up of a spectrum of colors, which includes red, orange, yellow, green, blue, indigo, and violet.

2. **Prism and Dispersion**: When white light passes through a prism, it undergoes a phenomenon called dispersion. This is where the different colors of light are separated due to their different wavelengths.

3. **Deflection of Colors**: Each color of light bends at a different angle when it passes through the prism. The amount of bending (or deflection) depends on the wavelength of the light.

4. **Order of Deflection**: Generally, shorter wavelengths (like violet and blue) are refracted more than longer wavelengths (like red). This means that violet light will be deflected the most, while red light will be deflected the least.

5. **Conclusion**: Therefore, when white light is passed through a prism, the color that deflects the least is red light.

### Final Answer:
The color that deflects least when white light is passed through a prism is **red light**.

---