Question

yellow light of wavelength 589 NM is incident on a boundary separating air and glass find the speed wavelength and frequency for reflected lightght and refracted light refractive index of Glass for yellow light is 1.5

Answer 1

Dear Student,


(i) For reflected light, the light is in the same medium of incidence so the speed is 3 x 10⁸ ms^-2 itself.

Wavelength also remains the same, that is 589 nm

Frequency = Velocity/Wavelength = 3 x 10⁸ / 589 x 10^-9 = 5.093 x 10¹⁴ Hz

(ii)Speed of light in glass = Speed of light in air / refractive index of glass = 3 x 10⁸ / 1.5 = 2 x 10⁸ ms^-2

Wavelength of light in glass = Wavelength of light in air / refractive index of glass = 589 / 1/5 = 392.67 nm

​ Frequency of light remains constant so it is ​5.093 x 10¹⁴ Hz itself.


Regards