Question

What is the Principle of Reversibility?

• A. If the final path of a ray of light is reversed after any number of reflections and refractions, then the ray retraces its entire path
• B. If the final path of a ray of light is reversed after any number of reflections and refractions, then the ray retraces half of its path.
• C. If the initial path of a ray of light is reversed after any number of reflections only, then the ray retraces its entire path
• D. If the final path of a ray of light is reversed after any number of refractions only, then the ray retraces its entire path.

Answer 1

The correct option is A

If the final path of a ray of light is reversed after any number of reflections and refractions, then the ray retraces its entire path

Principle of Reversibility: If the final path of a ray of light is reversed after any number of reflections and refractions, then the ray retraces its entire path.