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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 |
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a) |
He must direct the beam vertically upwards |
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b) |
He has to direct the beam horizontally |
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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 |
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d) |
He has to direction the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection |
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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 must direct the beam vertically upwards |
|
b) |
He has to direct the beam horizontally |
|
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 |
|
d) |
He has to direction the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection |
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(c) When incident angle is greater than critical angle, then total internal reflection takes place and will come back in same medium |