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

Answer 1

The correct option is B $n,\frac{\lambda }{\mu }$ and $\frac{v}{\mu }$

Refraction at a plane surface:
$\mu v=constant$ and $\mu \lambda =constant$
where, $\mu$ is the refractive index, v is the velocity, $\lambda$ is the wavelength.
Hence, the answer is $n,\frac{\lambda }{\mu }and\frac{v}{\mu }$