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

Multiple Choice

The pupil of a cat's eye narrows to a slit width of 0.5 mm in daylight. What is the angular resolution of the cat's eye in daylight (λ = 500 nm) ?

A) 0.01 rads
B) 10−5 rads
C) 10−3 rads
D) 10−4 rads
E) 0.1 rads