Q. The wavelength of sodium light in air is $5890\ \mathring{\mathrm{A}}$. The velocity of light in air is $3 \times 10^{8}ms^{- 1}$. The wavelength of light in a glass of refractive index 1.6 would be close to
A) 5890 $\mathring{\mathrm{A}}$
B) 3681 $\mathring{\mathrm{A}}$
C) 9424 $\mathring{\mathrm{A}}$
D) 15078 $\mathring{\mathrm{A}}$
Explanation
(b) $\lambda_{g} = \frac{\lambda_{a}}{\mu_{g}} = \frac{5890}{1.6} = 3681\ \mathring{\mathrm{A}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.