A ray of light travels from point A to point B, reflecting off a flat mirror . Prove that, in accordance with the law of reflection (the angle of incidence equals the angle of reflection), the ray follows the shortest path between points A and B.
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →