White Light Is Passed Through a Diffraction Grating That Has

Multiple Choice

White light is passed through a diffraction grating that has 2.50 × 10⁵ lines/m. On each side of the white central maximum, a spectrum of colors is observed. What is the wavelength of the light observed at an angle of 7.00° in the first-order bright fringes?

A) 487 nm
B) 589 nm
C) 632 nm
D) 668 nm
E) 731 nm