Light of wavelength 5000 x 10-8cm travels in free space with a velocity of 3 x 108ms-1. What is its wavelength in glass of refractive index 1.5?
-
A.
3333 x 10-8cm -
B.
5000 x 10-8cm -
C.
6666 x10-8cm -
D.
750010-8cm
Correct Answer: Option A
Explanation
n = (frac{text{wavelength in space}}{text{wavelength in glass}})
1.5 = (frac{5000 times 10^{-8}}{lambda g})
(lambda)g = 3333 x 10-8cm