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JEE Main 20253 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
3 April
Shift
Evening Shift
Subject
Physics
Chapter
Wave Optics

JEE Main 2025 · 3 April · Evening Shift · Physics · Wave Optics

A monochromatic light of frequency 5 × 10^ 14 ~Hz travelling...

A monochromatic light of frequency 5×1014 Hz5 \times 10^{14} \mathrm{~Hz} travelling through air, is incident on a medium of refractive index ' 2 '. Wavelength of the refracted light will be :

Options

  1. A300 nm300\mathrm{~nm}
  2. B600 nm600\mathrm{~nm}
  3. C400 nm400\mathrm{~nm}
  4. D500 nm500\mathrm{~nm}

Correct answer

A. 300 nm300\mathrm{~nm}

Step-by-step solution

fλ=vλmedium =λvacuum μλmedium ⇒3×1082×5×1014⇒0.3×10−6⇒300\mathrm{f} \lambda=\mathrm{v} \quad \lambda_{\text{medium }}=\frac{\lambda_{\text{vacuum }}}{\mu} \lambda_{\text{medium }} \Rightarrow \frac{3 \times 10^8}{2 \times 5 \times 10^{14}} \Rightarrow 0.3 \times 10^{-6} \Rightarrow 300nm\mathrm{ nm}
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