A light wave of frequency 5 x 1014Hz moves through water which has a refractive index of (frac{4}{3}). Calculate the wavelength in water if the velocity of light in air is 3 x 108ms-1
-
A.
4.5 x 10-7m -
B.
6.0 x 10-7m -
C.
1.7 x 106m -
D.
2.2 x 106m
Correct Answer: Option A
Explanation
(frac{1}{4}) = (frac{3 times 10}{v})
v = 2.25 x 108ms-1
(lambda) = (frac{V}{F})
= (frac{2.25 times 10^8}{5 times 10^14})
(lambda) = 0.45 x 10-6m