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Solar Radiance - Reflection
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[QUOTE="cpmiller, post: 2617357, member: 173599"] [h2]Homework Statement [/h2] An underwater observer is looking directly into the sun. His head is near, but below the surface, and he is not wearingsun glasses. Let L[SUB]s[/SUB](x) be the solar radiance at the water surface, on the air side, when the sun is at a zenith angle x. What is the ratio of the solar radiance at the observer's eye to the solar radiance just above the water surface? [h2]Homework Equations[/h2] Here's where I'm having trouble. I'm not sure which equation is relevant. Is this simply a Fresnel transmission problem? I have equations for vertical and horizontal polarization Rh = [sin[SUP]2[/SUP](x[SUB]a[/SUB] - x[SUB]w[/SUB])]/[sin[SUP]2[/SUP](x[SUB]a[/SUB] + x[SUB]w[/SUB])] But I also have a solid angle formula for radiance at the air water boundary. It is labeled "From Snell's law and flux conservation" [tex]\Omega[/tex][SUB]a[/SUB] = n[SUP]2[/SUP] [cos x[SUB]w[/SUB]/ cos x [SUB]a[/SUB] ] [tex]\Omega[/tex] [SUB]w[/SUB] Where the [tex]\Omega[/tex]s are solid angle. The subscript a one is subtended by L[SUB]s[/SUB] in the accompanying diagram. And the subscript w by L[SUB]d[/SUB] (downwelling) so I'm not sure if this ratio would be what I need. Any thoughts? Thanks for your help! [/QUOTE]
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