Helium-Neon Laser Light $\lambda$ = 633 * 10 ^{- 7} M)is Sent Through a 0

Multiple Choice

Helium-neon laser light ( $\lambda$ = 6.33 * 10 ^{- 7} m) is sent through a 0.30 mm-wide single slit.What is the width of the central maximum on a screen 1.0 m from the slit?

A) 2.0 cm
B) 4.2 mm
C) 1.1 cm
D) 2.0 mm
E) 0.70 mm