White light is dispersed using a prism by means of:

Options

A. reflection
B. refraction
C. diffraction
D. interference

Explanation

**Step-by-Step Solution:**

1. **Understanding White Light:**
White light is a combination of all colors of light in the visible spectrum. It can be separated into its constituent colors.

2. **What is a Prism?**
A prism is a transparent optical element with flat, polished surfaces that refract light. It is typically made of glass or other transparent materials.

3. **Dispersion of Light:**
Dispersion is the process in which white light is separated into its different colors when it passes through a prism. This occurs because different colors of light have different wavelengths and refract at different angles.

4. **Refraction in a Prism:**
When white light enters a prism, it slows down and bends due to refraction. The amount of bending depends on the wavelength of the light. Shorter wavelengths (like violet) bend more than longer wavelengths (like red).

5. **Result of Dispersion:**
As a result of this differential bending, the white light is spread out into a spectrum of colors, typically red, orange, yellow, green, blue, indigo, and violet (often remembered by the acronym ROYGBIV).

6. **Conclusion:**
Therefore, white light is dispersed using a prism primarily by the process of **refraction**.

**Final Answer:** White light is dispersed using a prism by means of **refraction**.

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