A Beam of Light That Consists of a Mixture of Red

Multiple Choice

A beam of light that consists of a mixture of red light ( $\lambda$ = 660 nm in vacuum) and violet light ( $\lambda$ = 410 nm in vacuum) falls on a grating that contains 1.0 × 10⁴ lines/cm. Find the angular separation between the first-order maxima of the two wavelengths if the experiment takes place in a vacuum.

A) 11°
B) 17°
C) 24°
D) 41°
E) 65°