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A large glass slab ( = 5 3 ) of thickness 8 cm is placed over a point source of light on a plane surface. It is seen that light emerges out of the top surface of the slab from a circular area of radius R ~cm . What is the value of R ?

Correct answer

0

Step-by-step solution

R t = _C or R=t ( _C ) aligned & But, _C= 1 = 3 5 & _C= 3 4 & R= 3 4 t= 3 4 (8 ~cm )=6 ~cm & aligned Hence the answer is 6 .

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