Question

describe a activity to show that light chooses the path which which take least time to travel​

Answer 1

To describe the light take least time here the Fermat's principle is used.

• This principle describes that due to the property of light to travel in straight line which helps to describe the property of light to travel fast.
• If we consider a  rubber tube and put a burning candle in front of the tube.
• When we see from the hole of the tube as the tube is straight we are able to see the light of candle
• But when we bent the rubber tube we are not able to see the light
• That shows if we bent which means the light straight path is broke due to which length of the tube increases.
• As with increase it take much time to travel until till it reaches in his straight path.