A beam of light of wavelength 474 nm passes through two closely spaced glass pla

Question

A beam of light of wavelength 474 nm passes through two closely spaced glass plates, as shown in the figure below. For what minimum nonzero value of the plate separation d will the transmitted light be bright? This arrangement is often used to measure the wavelength of light and is called a Fabry-Perot interferometer.
d = nm

A beam of light of wavelength 474 nm passes through two closely spaced glass plates, as shown in the figure below. For what minimum nonzero value of the plate separation d will the transmitted light be bright? This arrangement is often used to measure the wavelength of light and is called a Fabry-Perot interferometer.

Explanation / Answer

What you are describing is a version of something called a Fabry

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