An obliquely incident light ray bends at the surface due to change in speed, when passing from one medium to another. The ray does not bend when it is incident normally. Will the ray have different speed in the other medium ?

Answer

To solve the question, we need to analyze the behavior of light as it passes from one medium to another, specifically focusing on the concepts of refraction and the speed of light in different media.

### Step-by-Step Solution:

1. **Understanding Refraction**: Refraction occurs when light travels from one medium to another and changes speed. This change in speed causes the light ray to bend at the interface between the two media.

2. **Normal Incidence**: When light is incident normally (perpendicular) to the surface of the medium, it does not bend. This is because the angle of incidence is 0 degrees, and according to Snell's law, the angle of refraction is also 0 degrees, meaning the light continues straight through.

3. **Speed of Light in Different Media**: The speed of light is different in different media. For example, light travels faster in air than in water or glass. The change in speed is what causes the bending of light when it enters a new medium at an angle.

4. **Conclusion**: Yes, the ray will have a different speed in the other medium. When light enters a medium with a different optical density, its speed changes, which is responsible for the bending of the ray when it is incident obliquely.

### Final Answer:
Yes, the ray will have a different speed in the other medium.

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