(a) What is the intensity (in W/cm?) on the retina when looking directly at the sun? Assume that the eye's pupil has a radius rpupil = 1 mm. Take the Sun's irradiance at the earth's surface to be 1.1 kW/m?, and neglect refractive index (i.e. set n = 1). HINT: The Earth-Sun distance is do = 1.5 x 108 km and the pupil-retina distance is d; = 22 mm. The radius of the Sun rSun = 7.0 x 105 km is de-magnified on the retina according to the ratio d;/do.

(a) What is the intensity (in W/cm?) on the retina when looking directly at the sun? Assume that the eye's pupil has a radius rpupil = 1 mm. Take the Sun's irradiance at the earth's surface to be 1.1 kW/m?, and neglect refractive index (i.e. set n = 1). HINT: The Earth-Sun distance is do = 1.5 x 108 km and the pupil-retina distance is d; = 22 mm. The radius of the Sun rSun = 7.0 x 105 km is de-magnified on the retina according to the ratio d;/do.