Please answer in detail with all calculations and work.

(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 pupil = 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 di = 22 mm. The radius of the Sun Sun = 7.0 x 10 km is de-magnified on the retina according to the ratio dildo. (b) What is the intensity at the retina when looking directly into a 1 mW HeNe laser? Assume that the smallest radius of the laser beam is /waist = 0.5 mm positioned do = 2 m in front of the eye, and that the entire beam enters the pupil. Compare with part (a)