Optics Question 755
Question: Absolute refractive indices of glass and water are $ \frac{3}{2} $ and $ \frac{4}{3} $ . The ratio of velocity of light in glass and water will be
[UPSEAT 1999]
Options:
A) 4 : 3
B) 8 : 7
C) 8 : 9
D) 3 : 4
Show Answer
Answer:
Correct Answer: C
Solution:
$ v\propto \frac{1}{\mu }\Rightarrow $
$ \frac{v _{1}}{v _{2}}=\frac{{\mu _{2}}}{{\mu _{1}}}\Rightarrow \frac{v _{g}}{v _{w}}=\frac{{\mu _{w}}}{{\mu _{g}}}=\frac{4/3}{3/2}=\frac{8}{9} $
