Two coherent wavelengths of light are incident on a double slit, one of the wavelengths corresponds...

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Physics

Two coherent wavelengths of light are incident on a doubleslit, one of the wavelengths corresponds to blue light of 460 nmand the other is unknown. The slit separation is 0.007 mm. Thesecond-order bright fringe of the blue light falls at the sameangle as the first order light of the other wavelength.
(a) Determine the unknown wavelength.
(b) Determine the number of fringes of these two wavelengthsvisible to one side of the zeroth order bright fringe.
(c) Suppose a screen were placed 30 cm from the slits. How large ofa screen would be required to fit all of the fringes from part(b)?
(d) Describe how the appearance of the fringes would change if agrating of equal slit separation were used in place of the doubleslits. Include any changes to fringe separation or brightness inyour description.

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4.2 Ratings (755 Votes)

a We know for interference1d is the seperation between the slit n is the order andis the wavelengthd0007mm 0007103mfor blue 460nm 460109 mfor n20007103sin 2460109sin 24601090007103 013 2for unknown wavelength0007103 013 2 since 2nd order has same angle for See Answer

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