Question

What is visible spactrum 1. Why is red used as the stopping light at traffic signals 2. Two tiangular glass prism are kept together connected through their rectangular side a white beam is passed through one side of the combination. Will there be any dispersion? justify your answer

Answer 1

Answer:

The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye

red has a higher wave length. so it travels a greater distance. thus the passengers can be warned at a longer distance itself.

when white light enters the first prism the light disperses. later when it enters the 2nd prism the disperded light is again joined to form white light. thus white light comes out from the other side.