You're asking about refraction in a transverse wave, which is a bit tricky because the concept of refraction is usually associated with longitudinal waves, like sound waves.

Here's why:

* Refraction is the bending of a wave as it passes from one medium to another. This happens because the wave's speed changes as it enters the new medium.

* Transverse waves like light waves and some water waves, have oscillations perpendicular to the direction of wave propagation. Their speed is determined by the properties of the medium they travel through.

So, while refraction can happen with transverse waves, it's not as straightforward as with longitudinal waves. Here's how it works:

1. Change in Speed: When a transverse wave enters a new medium, its speed changes based on the medium's properties (e.g., density, elasticity). This change in speed is what causes the wave to bend.

2. Change in Direction: The direction of the wave's propagation changes because the wavefront (the line of constant phase) is not parallel to the boundary between the two media.

3. Snell's Law: Although not as strictly defined for transverse waves as it is for longitudinal waves, a similar principle applies. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is approximately equal to the ratio of the wave speeds in the two media.

Example:

Imagine a water wave moving from deep water to shallow water. The wave slows down in shallow water, causing a change in its direction and bending the wave. This is a similar phenomenon to the refraction of light as it passes from air to water.

Key Point: The bending of a transverse wave due to a change in speed is still considered refraction, even if it's not as straightforward as with longitudinal waves. The concept of wavefronts and Snell's Law can still be used to describe this phenomenon.