A large glass slabe (mu=5//3) of thickne...

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

6 cm

7 cm

8 cm

9 cm

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