Electronics and Communication Engineering - Electromagnetic Field Theory - Discussion

3. 

Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 1014 Hz in glass. Assume velocity of light is 3 x 108 m/sec in vacuum.

[A]. 4 μm
[B]. 3 μm
[C]. 2 μm
[D]. 1 μm

Answer: Option C

Explanation:

Given, μ = 1.6, f = 1014 Hz, v = 3 x 108 m/sec.


Prachi said: (Oct 28, 2015)  
We can not consider the value of 1.6?

Bittu said: (Aug 24, 2016)  
Here refractive index given -1.5.

Then why 1.6 considered?

Shree said: (Aug 7, 2017)  
Refractive index is mentioned as 1.5 not 1.6.

It will get another answer not 2 micrometre.

Suraj Rathod said: (Sep 10, 2017)  
Answer is 1.5 um.

Sunni said: (Sep 14, 2017)  
No, answer is 2 that is print mistake 1.5 not 1.6.

Pradeep Rathod said: (Jan 12, 2020)  
C/f = 3x10^8/10^14 = 3um/1.5 = 2μm.

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