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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 



Your Answer
A

He must direct the beam vertically upwards

Your Answer
B

He has to direct the beam horizontally

Correct Answer
C

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

Your Answer
D
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

Solution

The correct option is C

He has to direct the beam at an angle to the vertical which is slightly 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. 

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