Optics
Law of Reflection
The angle of incidence equals the angle of reflection, measured from the normal to the surface.
Variables
θi°
Angle of incidence
θr°
Angle of reflection
Your notes
0/5000
Where this formula is listed
- Optics formulas, under Reflection, alongside Mirror Magnification, Focal Length and Radius, Fresnel Reflection (Normal Incidence) and Spherical Mirror Focal Length.
- In the optics list it comes before Mirror Equation.
- Optics formula sheet, one of 34 formulas printed with symbol keys and SI units.
- The full formula index, grouped by category and topic.
Common questions
What is the Law of Reflection formula?
Law of Reflection is written θ_i = θ_r. The angle of incidence equals the angle of reflection, measured from the normal to the surface. It belongs to Optics, under Reflection.
What are the units in θ_i = θ_r?
In SI units, θ_i is angle of incidence, measured in °; θ_r is angle of reflection, measured in °.