Question

The frequency and wavelength of light in a material are $4\times {10}^{14}Hz$ and $5\times {10}^{-7}$ meter. The refractive index of material is :

• A. 1.33
• B. 1.5
• C. 1
• D. 0.77

Answer 1

The correct option is B 1.5

$\nu =4\times {10}^{14}Hz$

$\lambda =5\times {10}^{-7}m$

$v=\nu \times \lambda$ = $2\times {10}^{8}m$

$refractiveindexofmaterial=velocityinvacuum/velocityinmedium=3\times {10}^8/2\times {10}^8=1.5$