Question

A ray of light of wavelength $u_0$ and frequency $v_0$ enter a glass slab of refractive index $\mu$ from air. Then

• A. its wavelength increases, frequency decreases.
• B. its wavelength decreases, frequency remains same.
• C. its wavelength increases, frequency remains same.
• D. $\Delta ={\lambda }_0(\frac{1}{\mu }-1)$ and $\Delta v=0$.

Answer 1

Answer: (B), (D)

its wavelength decreases, frequency remains same.
$\Delta ={\lambda }_0(\frac{1}{\mu }-1)$ and $\Delta v=0$.

the wavelength in the medium is $\frac{\lambda }{\mu }$
frequency doesn't change
${\Delta }_{\lambda }=\lambda (\frac{1}{\mu }-1)$ and $\Delta v=v-v=0$
Hence option $B,D$ are correct