Question

An electromagnetic radiation of frequency n, wavelength $\lambda$, travelling with velocity v in air, enters a glass slab of refractive index \mu . The frequency, wavelength and velocity of light in the glass slab will be respectively

• A. $n, 2 \lambda \, \, and \, \, \frac{v}{\mu }$
• B. $\frac{2n}{\mu}, \frac{\lambda}{\mu}$ and $v$
• C. $\frac{n}{\mu } , \frac{\lambda}{ \mu }$ and $\frac{v }{\mu }$
• D. $\frac{n}{\mu }$ and $\frac{v}{\mu }$

Answer 1

Answer: (D)

$\frac{n}{\mu }$ and $\frac{v}{\mu }$

Answer 2

: Frequency = n; Wavelength = $\lambda$; Velocity of
air = v and refractive index of glass slab = $\mu$
Frequency of light remains the same, when it

changes the medium. Refractive index is the ratio
of wavelengths in vacuum and in the given medium.
Similarly refractive index is also the ratio of
velocities in vacuum and in the given medium.