A skydiver is falling towards the ground. How close to the ground will she have to be before she can distinguish 2 yellow baseballs lying?

Question

lying 25cm apart, reflecting 570nm light in the air? Her pupil diameter is 3.35mm. Assume the speed of light in the human eye is 2.21 x 10^8 m/s.

Answer 1

Well let's see, 25cm by 570nm and 3.35mm across... 2.21, and well... I think she'd have to be pretty darn close.