# Physics P1 5.4 Wave properties: refraction.

HideShow resource information
What is refraction of light?
Refraction of light is the change of direction of a light ray when it crosses a boundary between two transparent substances.
1 of 16
Why do waves change speed?
Waves change speed when the cross a boundary between different substances.
2 of 16
What happens to wavelength when the wave crosses a boundary?
The wavelength of the wave changes but the frequency stays the same.
3 of 16
In what kind of waves does refraction occur?
Refraction is a property of all waves, including light and sound.
4 of 16
What happens when a light ray crosses a boundary?
A light ray refracts when it crosses a boundary between two substances such as air and glass, or air and water.
5 of 16
What causes the wave to change in direction?
The change in speed of the waves.
6 of 16
What happens when light enters a more dense substance?
When light enters a more dense substance, such as going from air to glass it slows down and the ray changes direction towards the normal.
7 of 16
What happens when light enters a less dense substance?
When light enters a less dense substance, such as going from glass to air, it speeds up and the ray changes direction away from the normal.
8 of 16
What happen if the wave is travelling along a normal?
If the wave is travelling along a normal then it will not change direction.
9 of 16
What happens when a ray of white light is shone onto a triangular glass prism, why and what is it called?
Different colours of light have different wavelengths and are refracted by slightly different amounts, therefore a spectrum is produced - this is called dispersion.
10 of 16
What colour light is refracted the most?
Violet.
11 of 16
What colour light is refracted the least?
Red.
12 of 16
Why does refraction take place?
Because waves change speed when they cross a boundary.
13 of 16
Why does light split up into different colours when it passes through a triangular prism?
Because different wavelengths of light are refracted by different amounts.
14 of 16
**DO NOT CONFUSE REFLECTION AND REFRACTION**
**A RAY OF LIGHT TRAVELLING ALONG A NORMAL IS NOT REFRACTED**
15 of 16
**LOOK UP DIAGRAM OF REFRACTION OF LIGHT**
**
16 of 16

## Other cards in this set

### Card 2

#### Front

Why do waves change speed?

#### Back

Waves change speed when the cross a boundary between different substances.

### Card 3

#### Front

What happens to wavelength when the wave crosses a boundary?

### Card 4

#### Front

In what kind of waves does refraction occur?

### Card 5

#### Front

What happens when a light ray crosses a boundary?