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A sodium vapor light isotropically emits 15W of light energy at 589 nm. If your pupil...

A sodium vapor light isotropically emits 15W of light energy at 589 nm. If your pupil has a diameter of 4.5 mm, how many photons will pass into your eye every second from a distance of 12 m? 12 km? The threshold of seeing is about 5 photons/second. How far away can you see this 15W bulb? Note that the flux of a light source is the power absorbed/area.

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ort 1km 41T (12-000广 S78 3:31 10 t丁 to 10 m a 2(a.cyぱも)TS. %) 00o

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