Big Picture:
Circuits
Reflection
LED Lights
Curved Mirror
Focal point
Focal length
Principle and Concept:
Our principle is focusing on an optical system and measuring how strongly the experiment diverges or converges light. The focal length in a concave mirror is always positive while that of the convex mirror is always negative. This also works with the law of reflection which is the angle of incidence which is equal to the angle of reflection.
Keywords and Units:
1/2 * R for concave (point on the principal axis) and convex (point on the optic axis) mirror.
Figures: