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  4. Monochromatic light of wavelength 589 nm in incident from air on a water surface. λ1 and λ2 are the wavelength of reflected and refracted light respectively, v1 and v2 are the velocities of reflected and refractive light, respectively. [Refractive index of water is 1.33] The velocities of reflected and refracted light is v1 and v2, respectively. Then, (v1/v2) is (ratio of frequency) is

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Q. Monochromatic light of wavelength $589\, nm$ in incident from air on a water surface. $\lambda_{1}$ and $\lambda_{2}$ are the wavelength of reflected and refracted light respectively, $v_{1}$ and $v_{2}$ are the velocities of reflected and refractive light, respectively. [Refractive index of water is $1.33$]
The velocities of reflected and refracted light is $v_{1}$ and $v_{2}$, respectively. Then, $\frac{v_{1}}{v_{2}}$ is (ratio of frequency) is

Wave Optics

Solution:

On reflection and refraction, frequency of light remains the same.
$\frac{v_{2}}{v_{2}^{\prime}}=1$