Optics

Asked by  | 13th Jan, 2010, 11:15: PM

Expert Answer:

The frequency remains same. i.e.  v/λ

vgg = vww where v is the speed of light in the media and λ is the wavelength.

vg/cλg = vw/cλw

1/μgλg = 1/μwλw

μg = μwλwg=(4/3)(5/4) = 5/3.... since wavelength = thickness/no of waves.

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Answered by  | 13th Jan, 2010, 11:44: PM

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