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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- UGC NET
- Physics (PH)
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Sanchari Pal
this was my question, how the wavelebgth can change? Is'nt wave length is the fundamental property of light wave? Is'nt change in wave length mean the change in frequency? suppose A red light was involved in the interference then it can't turn to a orange one by just the changing the refractive index??
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No, it's not due to change in frequency, rather it is due to change in velocity in different mediums. wavelength is given by velocity/frequency. So, in case of vacuum we write c/frequency.
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We call this one as effective wavelength.
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Dr. manish kumar gupta
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it's very simple only enviornment is changed so the effective wavelength of the light will change. wavelength of light in any medium decreases (when compared with vacuum) by factor of refractive index of medium. now fringe width is proportional to wavelength, so fringe width should also decrease by factor of two.
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Sanchari Pal
yeah, yeah, I was doing it wrong I was thinking frequency =1/wavelength.. but its C/wavelength.. Thank you sir