What is the smallest diameter spot the eye can produce on the retina if the pupil diameter is 4.10 {rm mm}? Assume light with a wavelength of lambda = 600 {rm nm}. (Note: The distance from the pupil to the retina is 25.4 {rm mm}. In addition, the space between the pupil and the retina is filled with a fluid whose index of refraction is n = 1.336.