Unpolarized and polarized lightformula

Optional. A grating with 12,000 lines per centimeter is used with light of wavelength 650nm. What is the angle of the first bright spot? __________

Optional. Suppose double slits are spaced 1.33×10?4 m apart and light of 500nm wavelength shines through them. What distance from the center spot will the second bright spot appear on a screen 4m away? __________

Unpolarized and polarized lightdifference

Unpolarized light

Optional. What effect on the double slit pattern will result from an increase in the wavelength of light? ____________________