Law of reflection
When light reflects from a surface, the angle between the reflected ray and the normal - a line drawn at right angles to the surface where the light hits - always equals the angle between the incoming ray and the normal. The incoming ray, the reflected ray and the normal all lie in one flat plane. A ray that arrives along the normal goes straight back. The law holds for rough surfaces too: each tiny piece of the surface obeys it, but the pieces face different ways.
Depth 1 · Foundation
You can draw the normal, measure the angles of incidence and reflection from it, use the law of reflection to say where a reflected ray will go, and explain why it still holds for rough surfaces.
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Foundation
You can draw the normal, measure the angles of incidence and reflection from it, use the law of reflection to say where a reflected ray will go, and explain why it still holds for rough surfaces.
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