1.

A large glass slab (μ = 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?

Answer»

sin C = 1/n = 3/5 = R/(R2 + t2)1/2

t = 8 Cm 

R = 6 Cm



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