|SimReal: Physics - Light - Reflection|
In the picture to the left you see two points A and B and a horizontal line.
Three questions that can be answered by the same strategy:
Where should we place a point C on the horizontal line to construct the shortest line ACB?
Where should we place a point C on the horizontal line to run fastest along the line ACB running with constant speed?
Sending light from A, at what point C on the horizontal will the light be reflecting to the point B?
Use this simulation and/or go to Exercise to try to find the answers to these three questions.