1. When the eye looks at a star (a point of light), diffraction at the pupil spreads the image of the start on the retina into a small disk
a.) When opened to the maximum size, the diameter of the pupil of a human eye is 7.0 mm. Assuming the starlight has a wavelength of 550 nm, what is the angular size of the image on the retina?
b.) The distance from the pupil to retina is 23 mm. What is the linear size of the image of the start on the retina?
c.) At the midpoint of the retina (the fovea), there are 150,000 light sensitive cells (rods) per mm
2. How many of these cells are illuminated when the eye looks at a start?