Reflection of light

In this lesson, we will learn:

• The key terms in reflection
• Types of reflection
• The laws of reflection
• Solve reflection problems

• 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 (< $i$ ): The angle between the NORMAL and the incident ray
• Angle of reflection (< $r$): The angle between the NORMAL and the reflected ray

• Laws of Reflection
1. Incident ray, reflected ray, and normal all lie in the same plane called plane of incidence
2. Angle of incidence equals to angle of reflection (< $i$= < $r$)