Question

When a glass slab is placed on a dot on a paper.It apperas displaced by`4`cm viewed normally.What is the thickness of slab if the refractive index`1.5`.

Answer 1

We know that Displacement =`t(1-(1)/(mu))`
So`4=t(1-(1)/(mu))`
`t=(muxx4)/(mu-1)=(1.5xx4)/(1.5-1)=12cm`