A beam of light of wavelength 471 nm passes through two closely spaced glass pla

Question

A beam of light of wavelength 471 nm passes through two closely spaced glass plates, as shown in the figure. 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.)

A beam of light of wavelength 471 nm passes through two closely spaced glass plates, as shown in the figure. 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.) Submit Answer Tries 0/20

Explanation / Answer

here

if the path length difference was equal to lambda, then the transmitted light is bright

but the path difference is 2d

then

2 * d = lambda

d = lambda / 2

d = 471 * 10^-9 / 2

d = 235.5 nm

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