New
New
Year 11
AQA
Foundation

# Reflection of light

I can recognise, draw and describe how light and other waves can reflect from different surfaces, using rays and wavefronts.

New
New
Year 11
AQA
Foundation

# Reflection of light

I can recognise, draw and describe how light and other waves can reflect from different surfaces, using rays and wavefronts.

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## Lesson details

### Key learning points

1. Different surfaces can scatter light or reflect light in a regular way.
2. The angle of incidence equals the angle of reflection. Angles are measured from the normal.
3. Light can be thought of as a wave (ripples) in electric and magnetic fields.
4. Like all waves, light can be represented using rays or wavefronts.

### Common misconception

Pupils often think that light rays are actual physical things that are the constituents of light.

It needs to be made explicit through teaching that light rays are imaginary lines that show the direction in which light is travelling.

### Keywords

• Ray - A ray is a straight line drawn to represent the direction that a light wave travels.

• Normal - The normal is an imaginary line drawn at 90° to a surface.

• Wavefront - Wavefronts are lines drawn to represent peaks of a wave.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
Match each angle to its description.
Correct Answer:90°,this is the angle between one side of a square and the next side

this is the angle between one side of a square and the next side

Correct Answer:180°,if you turn by this angle, you face in the opposite direction

if you turn by this angle, you face in the opposite direction

Correct Answer:360°,if you turn by this angle, you face in the same direction as before

if you turn by this angle, you face in the same direction as before

Q2.
The protractor is measuring the angle between the two lines. What is the correct measurement?
45°
145°
155°
Q3.
Which letter is labelling a peak (also called a crest) of this wave?
a
c
d
Q4.
A person holds a lit candle in front of a mirror and is looking at the candle’s reflection. Starting with where the light is given out, put these objects into the order of the path the light takes.
1 - the candle
2 - the mirror
3 - the person's eyes
Q5.
What happens to light when it reflects off an object?
the light enters the object but does not come back out
the light passes through the object
Correct answer: the light bounces off the surface of the object
Correct answer: the light changes direction
the light continues travelling in the same direction
Q6.
Which letter represents one wavelength?
a
c
d

## Exit quiz

### 6 Questions

Q1.
Match each word with its definition.
Correct Answer:normal,an imaginary line drawn at 90° to a surface

an imaginary line drawn at 90° to a surface

Correct Answer:ray,a straight line drawn to show the direction a wave travels

a straight line drawn to show the direction a wave travels

Correct Answer:wavefront,a line drawn to represent where the peak of a wave is

a line drawn to represent where the peak of a wave is

Q2.
A ray diagram shows a light ray. Which statement about the ray is correct?
The ray in the diagram represents one of the many rays that make up the light.
The length of the ray represents the wavelength of the wave.
Correct answer: The arrow shows the direction in which energy is transferred.
Q3.
A person speaks to another person across a room. Which statements are correct?
Correct answer: Speaking makes air particles oscillate.
Correct answer: Speaking transfers some energy from the speaker to the listener.
Speaking makes air particles travel from the speaker to the listener.
Q4.
Which statement describes the law of reflection?
The incident ray equals the reflected ray.
Correct answer: The angle of incidence equals the angle of reflection.
The incident ray is perpendicular to the reflected ray.
The angle of incidence and the angle of reflection add to 90°.
Q5.
Here is a ray diagram for the reflection of a wave. In which diagram is the angle of reflection shaded?
Correct Answer: An image in a quiz
Q6.
The ray diagram represents the reflection of a light wave by a mirror. Which diagram correctly shows the wavefronts?
Correct Answer: An image in a quiz