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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?

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In the figure, C represents the critcal angle
``:'`sinC=(1)/(mu)=(3)/(5)` `:'``tanC=(3)/(4)`
In `triangle`POM, `tanC=(OM)/(PM)=R/(8)` `:'``R=(3)/(4)xx8=6cm`
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