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.
