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} $



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