Question

Light of wavelength 6000Å enters from air into water (a medium of refractive index 4/3). Find the speed and wavelength [c = 3 × 108 m/s]​

Answer 1

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c = Speed of light in air → 3 X 10^8 m/s

W → Wavelength

n → Refractive index of the medium = 1.5

W in air = 6000 A = 6 X 10^-7 metres

λ → Frequency in air = c / W in air = 5 X 10^14 Hz

n = W in air / W in the medium

1.5 = 6000 / W in the medium

W in the medium = 4000 A

Magnitude of frequency depends upon the light producing source hence it remains constant throughout ( 5 X 10^14 Hz) .

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Answer 2

c = Speed of light in air → 3 X 10^8 m/s

W → Wavelength

n → Refractive index of the medium = 1.5

W in air = 6000 A = 6 X 10^-7 metres

λ → Frequency in air = c / W in air = 5 X 10^14 Hz

n = W in air / W in the medium

1.5 = 6000 / W in the medium

W in the medium = 4000 A

Magnitude of frequency depends upon the light producing source hence it remains constant throughout ( 5 X 10^14 Hz) .