How Wide Must a Narrow Slit Be If the First

Multiple Choice

How wide must a narrow slit be if the first diffraction minimum occurs at ±12° with laser light of 633 nm?

A) 3.0 × 10−6 m
B) 3.0 × 10−5 m
C) 6.1 × 10−6 m
D) 6 .1× 10−5 m
E) 1.5 × 10−6 m