The normal line is a line at a right angle (90 degrees) to the surface of an object

To draw a normal line to the mirror, you must draw a line at 90 degrees to the surface of the mirror.

Reflection of waves - Reflection and refraction - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

Normal line - Tilted flat mirrors

Normal line - Flat mirrors

The geometric relationship between the surface normal, incidence angle

CHAPTER 1 - BASIC TERMS AND CALCULATIONS

Theorem - The tangent at any point of a circle is perpendicular to the radius through the point of contact - Circles

Normal Force, Definition, Equation & Examples - Lesson

Laws of Reflection - Definition, Types, Formula, Uses, & FAQs

Inclined Plane - Motion of Objects on an Incline, Solved Problems

Lesson Explainer: Critical Angle for Total Internal Reflection

Sectioning Technique Engineering Design - McGill University

Azimuth - Wikipedia

Perpendicular - Wikipedia

Laws of Reflection - Definition, Types, Formula, Uses, & FAQs

Normal Force, Definition, Equation & Examples - Lesson