Question

The pupil (the opening through which light enters the lens) of a house cat's eye is round under low light but ciliary muscles narrow it to a thin vertical slit in very bright light. Assume that bright light of wavelength 560 nm is entering the eye parallel to the principal axis of the lens and that the pupil has narrowed to a slit that is 0.500 mm wide. What are the three smallest angles on either side to the central maximum at which no light will reach the cat's retina for the following?

(a) if we imagine the eye is filled with air

m = 1	rad
m = 2	rad
m = 3	rad

(b) if we take into consideration that in reality the eye is filled with a fluid having index of refraction of approximately 1.4

m = 1	rad
m = 2	rad
m = 3	rad

Answer 1