Narrow, bright fringes are observed on a screen behind a diffraction grating. The entire experiment is then immersed in water. Do the fringes on the screen get closer together, get farther apart, remain the same, or disappear? Explain.
The edges of the fringes are getting closer to each other.
The dazzling fringe occurs when the crest of one waveform corresponds with the crest of another. The dark fringe occurs when the trough of one wave coincides with the trough of another, resulting in dark fringes.
We already know that . When the experiment is submerged in water, the frequency of the light stays constant, but the wavelengths drops as the movement slows. As the wavelength of light decreases, the fringes become closer together.
A Michelson interferometer uses light from a sodium lamp. Sodium atoms emit light having wavelengths and . The interferometer is initially set up with both arms of equal length , producing a bright spot at the center of the interference pattern. How far must mirror be moved so that one wavelength has produced one more new maximum than the other wavelength?
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