The bending of a beam of light when it passes obliquely from one medium to another is known as:

Options

A. reflection
B. refraction
C. dispersion
D. deviation

Explanation

To solve the question regarding the bending of a beam of light when it passes obliquely from one medium to another, we can follow these steps:

### Step 1: Understand the Question
The question asks about the phenomenon that occurs when light travels from one medium to another at an angle.

### Step 2: Identify the Options
The options provided are:
- Reflection
- Refraction
- Dispersion
- Deviation

### Step 3: Define Each Term
- **Reflection**: This is when light bounces back after hitting a surface.
- **Refraction**: This is the bending of light as it passes from one medium to another due to a change in speed.
- **Dispersion**: This refers to the separation of light into its component colors.
- **Deviation**: This is a general term that can refer to any change in direction.

### Step 4: Analyze the Relevant Term
Since the question specifically mentions the bending of light as it passes from one medium to another, we focus on refraction. Refraction occurs when light enters a different medium (like air to water) at an angle, causing it to bend.

### Step 5: Conclusion
Based on the definitions and the context of the question, the correct answer is **Refraction**.

### Final Answer
The bending of a beam of light when it passes obliquely from one medium to another is known as **Refraction**.

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