In one arm of a Michelson interferometer is a transparent container initially full of air, with internal length 6.76 cm in the beam direction. The container is slowly filled with a liquid, and you notice 105986 bright fringes on the photodiode at the interferometer output. If you are using laser light with wavelength 554 nm, what is the refractive index of the liquid? The refractive index of air at this wavelength can be taken as 1.0003. [Aside: you would need to have a slight tilt in the laser beam relative to the liquid surface, but this does not affect your result. ]

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Q: The minimum angle of resolution of the diffraction patterns of two identical monochromatic point…

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Q: A technician places a fluid substance, with a refractive index of 1.71, between two horizontal panes…

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Q: A diffraction grating has 600 lines per centimeter. At what angle will the first-order maximum be…

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Q: Light passes through a diffraction grating with a slit spacing of 0.001 mm. A viewing screen is 100…

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.