I was solving a past paper Young's Double Slit Experiment question and a part of it asked that what will happen to fringe separation and brightness when the wavelength of light is increase. I understand that fringe separation, x, will increase as . As about brightness, I think that it will remain unchanged, but the mark scheme says that it will be affected. I don't remember whether it said increase/decrease. Please explain.
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Last edited by Zishi; 11-04-2011 at 15:24.
- 11-04-2011 15:23
- 21-04-2011 09:32
As wavelength increases, the light from the same slit (of same intensity) is spread over a wider region. Therefore, decreasing brightness.