Reflection of Waves
Reflection is when a wave bounces off a surface, with the angle of incidence equal to the angle of reflection.
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Reflection is when a wave bounces off a surface, with the angle of incidence equal to the angle of reflection.
- Angles are measured from the normal
- Smooth surfaces give clear reflections
- Rough surfaces scatter light
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Reflection of Waves?
Within Physics, which covers forces, energy, waves, electricity, magnetism, light and space explained through motion and experiments, this topic explains Reflection of Waves. Physics topics explain how things move, push, heat up and carry energy, so each one here pairs a definition with a live model you can change.
Check that you can explain Reflection of Waves in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Reflection of Waves explains how the physical world behaves, from sport and transport to electricity and medicine.
Reflection of Waves in detail
When a wave hits a barrier, it can bounce back, following the law of reflection: the angle of incidence equals the angle of reflection, both measured from the normal, the line at right angles to the surface. A plane mirror forms a virtual image the same distance behind it as the object is in front.
Smooth surfaces give regular reflection, while rough ones scatter waves in many directions, called diffuse reflection. Reflection explains echoes, mirrors, radar and sonar, and curved reflectors such as satellite dishes focus waves at a point.
How the interactive helps you understand Reflection of Waves
Watch the light rays in the interactive. Use any sliders or buttons it offers to change the values and see how the light rays responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Reflection of Waves.
Real-life uses and examples
- Use Reflection of Waves to make sense of a practical and its results.
- Answer “explain” questions by linking Reflection of Waves to a clear cause and effect.
- Predict what a ball, car or circuit will do with Reflection of Waves before you do the calculation.
Common mistakes to avoid
- Mixing up Reflection of Waves with a related quantity that has different units.
- Forgetting that some quantities, such as force or velocity, also have a direction.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Reflection of Waves
What is Reflection of Waves?
Reflection is when a wave bounces off a surface, with the angle of incidence equal to the angle of reflection.
What are the most important points about Reflection of Waves?
The main points are: Angles are measured from the normal; Smooth surfaces give clear reflections; Rough surfaces scatter light.
Why is Reflection of Waves useful?
Understanding Reflection of Waves explains how the physical world behaves, from sport and transport to electricity and medicine.
How can I practise Reflection of Waves?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Reflection of Waves?
Related topics in Physics include Interference, Ultrasound and Sonar, Total Internal Reflection.