Question

The speed and wavelength of sodium yellow light in air are 3x108 m/s

and 6000Ao

respectively. Calculate their values in glass of refractive

index 1.5​

Answer 1

Answer:

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Answer 2

Explanation:

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PHYSICS

A light of wavelength 6000 A in air, enters a medium with refractive index 1.5. What will be frequency and wavelength of light in the medium?

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ANSWER

In air velocity of light is 3×10

8

m/s and wavelength is 6000A

o

=6000×10

−10

m

We know that c=λ×f , f=frequency

3×10

8

=6000×10

−10

×f

f=5×10

14

Hz

We know that refractive index n=

velocityoflightinmedium

velocityoflightinvacuum

=

v

c

Here c=3×10

8

m/s

So 1.5=

v

3×10

8

⟹v=2×10

8

m/s

Since frequency does not change when light enters from one medium to other.

v=λf

2×10

8

=λ×5×10

14

λ=4×10 −7

m=4000A

o