Question

Find the velocity of light in water, if its velocity in glass of refractive index 1.5 is `2 xx 10^(8)m//s`. The refractive index of water is 1.33.
A. `1.25 xx 10^(8)m//s`
B. `2.20 xx 10^(8) m//s`
C. `2.15 xx 10^(8)m//s`
D. `2.25 xx 10^(8) m//s`

Answer 1

Correct Answer - D
`v_(w) = (mu_(g))/(mu_(w))v_(g) = (1.5 xx 2 xx 10^(8))/(1.33) = 2.25 xx 10^(8) m//s`