試題詳解

55. When sitting in an airplane at an altitude of 10 km, you look down on the ground. Assuming that your pupil is about 1.5 mm in radius and considering the effect of diffraction only, what is the minimum separation s between objects on the ground that you can distinguish? (The wavelength of visible light is around 500 nm.)
(A) 0.5 m
(B) 2 m
(C) 8 m
(D) 20 m
(E) 50 m