What is refraction of light ? Give example.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Refraction**: Refraction of light is defined as the bending of light rays when they pass from one medium to another. This bending occurs due to a change in the speed of light in different media.

2. **Understanding Mediums**: A medium is a substance through which light travels. Common examples of mediums include air, water, and glass. Each medium has a different density, which affects the speed of light.

3. **Incident Light Ray**: When a light ray travels from one medium (like air) into another medium (like glass), it strikes the boundary between the two mediums at a certain angle, known as the angle of incidence.

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