Light travels through water with a speed of `2.25 xx 10^(8)m//s`. What is the refractive index of water ? Given speed of light in vacuum `= 3xx10^(8)m//s`.

Options

A. 1.41
B. 1.47
C. 1.33
D. 1.5

Answer

C

Explanation

Here, speed of light in water, `v = 2.25 xx 10^(8)m//s`
speed of light in vacuum, `c = 3 xx 10^(8)m//s`, refractive index, `n = ?`
From `n = c/v`,
`n = (3xx10^(8))/(2.25xx10^(8)) = 1.33`