. a) Discuss the principle of Michelson interferometer. How can it be used to determine the refractive index of a thin plate and wavelength of monochromatic light?
a) The Michelson interferometer is an optical instrument based on the principle of interference of light waves. It was invented by Albert A. Michelson in the late 19th century and has since become a fundamental tool in optics and interferometry.
Principle of Michelson Interferometer:
The Michelson interferometer consists of a beam splitter, two mirrors, and a detector. A beam of light is split into two parts by the beam splitter, and each part travels along a different path—one path reflects off a fixed mirror, and the other reflects off a movable mirror. The two beams are then recombined at the beam splitter and directed to a detector. Depending on the path difference between the two beams, interference either reinforces or cancels the light, producing an interference pattern at
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