SATHEE: Previous Year NEET Question- Wave Optics L-1

Question: The frequencyofalight wave in a material is $2 \times 10^{14} Hz$ and wavelength is $5000 \AA$ . The refractive index of material will be

A) 1.50

B) 3.00

C) 1.33

D) 1.40

Answer: 3.00

Sol:

$μ = \frac{velocity of light in vacuum (c)}{velocity of light in medium (v)}$ $\begin{aligned} ∴ v = v λ = 2 \times 10^{14} \times 5000 \times 10^{- 10} = 10^{8} m / s & ∴ μ = \frac{c}{v_{med}} = \frac{3 \times 10^{8}}{10^{8}} = 3 \end{aligned}$

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Question: The frequencyofalight wave in a material is 2×1014 Hz and wavelength is \AA5000\AA. The refractive index of material will be

Answer: 3.00

Sol:

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Question: The frequencyofalight wave in a material is $2 \times 10^{14} Hz$ and wavelength is $5000 \AA$ . The refractive index of material will be