(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.
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Transcribed Image Text:(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 dį = 22 mm. The
radius of the Sun rsun = 7.0 × 105 km is de-magnified on the retina
according to the ratio d;/do.
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