Under bright light the pupil of the eye (the circular opening through which light enters) is typically 2.0 mm in diameter. The diameter of the eye is about 25 mm. Suppose you are viewing something with light of wavelength 500 nm. Ignore the effect of the lens and the vitreous humor in the eye. (a) At what angles (in radians and degrees) will the first three diffraction dark rings occur on either side of the central bright spot on the retina at the back of the eye? (b) Approximately how far (in millimeters) from the central bright spot would the dark rings in part (a) occur? (c) Explain why we do not actually observe such diffraction effects in our vision. Example 23-9