Question

The wavelength of a monochromatic light in vacuum is $\lambda$. If travels from vacuum to a medium of absolute refractive index $\mu$. The ratio of wavelength of the incident and refracted wave is

• A. ${\mu }^2:1$
• B. 1 : 1
• C. $\mu$ : 1
• D. 1:$\mu$

Answer 1

Answer: (C)

$\mu$ : 1

${\left\{\mu \lambda \right\}}_{vacuum}={\left\{\mu \lambda \right\}}_{medium}\Rightarrow \frac{{\lambda }_i}{{\lambda }_r}=\frac{\mu }{1}\therefore Ratiois\mu :1$