Q. The refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is $6000\ \mathring{\mathrm{A}}$. The wavelength of this light when it passes through glass is
A) $4000\ \mathring{\mathrm{A}}$
B) $6000\ \mathring{\mathrm{A}}$
C) $9000\ \mathring{\mathrm{A}}$
D) $15000\ \mathring{\mathrm{A}}$
Explanation
(a) $\lambda_{medium} = \frac{\lambda_{air}}{\mu} = \frac{6000}{1.5} = 4000\ \mathring{\mathrm{A}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.