Problem: A scuba driver in a lake aims her underwater spotlight at the lake surface. (a) If the beam makes a 75° angle of incidence with respect to a normal to the water surface. Is it reflected, transmitted, or both? Find the angles of the reflected and transmitted beams (if they exist).(b) Repeat for a 25° angle of incidence. 

FREE Expert Solution

(a)

The critical angle for water-air surface:

θC=sin-1(ηaηw)

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Problem Details

A scuba driver in a lake aims her underwater spotlight at the lake surface. 

(a) If the beam makes a 75° angle of incidence with respect to a normal to the water surface. Is it reflected, transmitted, or both? Find the angles of the reflected and transmitted beams (if they exist).

(b) Repeat for a 25° angle of incidence. 


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