The Pupil of a Cat's Eye Narrows to a Slit

Multiple Choice

The pupil of a cat's eye narrows to a slit of width 0.5 mm in daylight.Assuming a wavelength of 500 nm,what is the angular resolution? (1 nm = 10−⁹ m)

A) 1 × 10−³ rad
B) 5 × 10−³ rad
C) 1 × 10−⁴ rad
D) 5 × 10−⁴ rad
E) ​2.5 × 10−⁴ rad