Q. A light wave has a frequency of $4 \times 10^{14}\ Hz$ and a wavelength of $5 \times 10^{- 7}\ metres$ in a medium. The refractive index of the medium is
A) 1.5
B) 1.33
C) 1.0
D) 0.66
Explanation
(a) $\mu = \frac{c}{v} = \frac{c}{v\lambda} = \frac{3 \times 10^{8}}{4 \times 10^{14} \times 5 \times 10^{- 7}} = 1.5$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.