Question

A diver in a swimming pool wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light.

• A. He has to direct the beam at an angle to the vertical which is less than the critical angle of incidence for total internal reflection
• B. He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection
• C. Hehas to direct the beam horizontally
• D. He must direct the beam vertically downwards

Answer 1

The correct option is A

He has to direct the beam at an angle to the vertical which is less than the critical angle of incidence for total internal reflection

When incident angle is greater than critical angle, then total internal reflection takes place and will come back in same medium.