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Monochromatic light having a wavelength of 589nm from the air is incident on a water surface. Find the frequency, wavelength and speed of (i) reflected and (ii) refracted light? [1.33 is the Refractive index of water]​

Answer 1

Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of

(a) Reflected, and

(b) Refracted light?

Refractive index of water is 1.33

ANSWER

(a) Reflected light: (wavelength, frequency, speed same as incident light)

Since, λ=589nm,c=3.00×10

8

ms

−1

Now, ν=

λ

c

=

589×10

−9

3×10

8

= 5.09×10

14

s

−1

(b) Refracted light: (frequency same as the incident frequency)

ν=5.09×10

14

Hz

v=

n

c

=2.26×10

8

ms

−1

λ=

ν

v

=444nm

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Answer 2

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