Reflection of light
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Intros
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Examples
Lessons
- What is the difference between regular reflection and diffuse reflection?
- Can you apply the laws of reflection for diffuse reflection? Explain
- An incident ray strikes the surface of a plane mirror making an angle of 30° with the normal. What is the angle of reflection?
- A reflected ray bounces off a boundary making an angle of 60° with the normal. What was the angle of incident?
- A ray making an angle of 30° with a smooth surface is reflected off the boundary. What would be the angle of reflection?
- The angle between the normal and incident ray is 45°. What is the angle between incident ray and reflected ray?
Topic Notes
In this lesson, we will learn:
- The key terms in reflection
- Types of reflection
- The laws of reflection
- Solve reflection problems
Notes:
Reflection of light: when light strikes objects, it is partly absorbed (as heat) and partly sent back (reflected)
Regular reflection Vs. Diffuse reflection
- Regular reflection: reflection of light by smooth surfaces such as mirror.
- Diffuse reflection: reflection of light by rough surfaces such. (most objects)
- Incident ray: The incoming ray of light
- Reflected ray: The outgoing ray of light
- Point of incidence: The intersection of incident ray and the boundary
- Normal: Imaginary line drawn perpendicular to the boundary at point of incidence
- Angle of incidence (< ): The angle between the NORMAL and the incident ray
- Angle of reflection (< ): The angle between the NORMAL and the reflected ray
- Laws of Reflection
- Incident ray, reflected ray, and normal all lie in the same plane called plane of incidence
- Angle of incidence equals to angle of reflection (< = < )