Question

A ray of light of wavelength $5400A^{\circ }$ suffers refraction from air to glass. Taking ${}_a{\mu }_g=\frac{3}{2}$. Find the wavelength of light in glass.

• A. 3600A⁰
• B. 1400A⁰
• C. 4900A⁰
• D. 6400A⁰

Answer 1

The correct option is A

3600A⁰

${}_a{\mu }_g=\frac{v_a}{v_g}=\frac{{\nu }_a{\lambda }_a}{{\nu }_b{\lambda }_b}{\Rightarrow }_a{\mu }_g={\lambda }_a{\lambda }_g\Rightarrow {\lambda }_g=5400\times \frac{2}{3}\Rightarrow {\lambda }_g=3600\stackrel{\circ }{A}$