How many refractions does a ray of light suffer on passing through a glass prism ?

Explanation

To determine how many refractions a ray of light suffers when passing through a glass prism, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Refraction**: Refraction occurs when light passes from one medium to another, causing it to change speed and direction. In the case of a prism, light moves from air (a less dense medium) into glass (a denser medium).

2. **Entering the Prism**: When the light ray first enters the glass prism from air, it refracts at the first surface (the air-glass interface). This bending of light occurs because the speed of light is different in air compared to glass.

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