Question

velocity of light in the glass is 2x10 and that in the air 3 by how much would an ink dot appear to be raised.when covered y a glass plate 6cm thick?

Answer 1

$$\begin{gathered} Refractiveindexofglass=\mu =\frac{c}{v}=\frac{3\times {10}^8}{2\times {10}^8}=1.5 \\ NowRefractiveindexofglass=\frac{Realdepthofinkdot}{Apperentdepthofinkdot} \\ or\mu =\frac{h}{d} \\ ord=\frac{h}{\mu }=\frac{6}{1.5}=4cm \\ Thereforetheinkdotwillappeartousasraisedby4cm. \end{gathered}$$