Question

A ray of light enters into a glass slab of refractive index μ from air. If λ is wavelength of light in air, then the wavelength of light in glass slab is

• A. $\frac{\lambda }{\mu }$
• B. λ
• C. μλ
• D. $\frac{\mu }{\lambda }$

Answer 1

The correct option is A $\frac{\lambda }{\mu }$

Refractive index, $mu=\frac{Speedoflightinair}{Speedoflightinglass}=\frac{c}{v}=\frac{{\lambda }_{air}}{{\lambda }_{glass}}$
$\Rightarrow {\lambda }_{glass}=\frac{{\lambda }_{air}}{\mu }=\frac{\lambda }{\mu }$
Hence, the correct answer is option (a).