Sunlight and Eyes

[robinson]

In normal room light, a healthy human pupil has a diameter of about 3-4 millimeters, in bright light, the pupil has a diameter of about 1.5 millimeters, and in dim light the diameter is enlarged to about 8 millimeters.^Wiki
I still think there is something wonky about the 900 times number, in regards to the heat energy. If it is a straight out multiplication of total energy, you could use sunlight to vaporize stuff, with just a 10 inch mirror. Something doesn't add up there.

 

[wollery]

http://www.bmas.org/how2buytscopebk.pdf

Both set of numbers bring up an interesting issue. Does that mean the heat energy is multiplied by that amount?

Either number means a 10 inch mirror can produce light well over half a million degrees F.

I don't buy that either.

So you're saying that the heat energy over an 8mm area from direct sunlight is well over 555 degrees F????

I think your maths is a bit wonky somewhere!

Oh, and a mirror of about 12" is used to light the Olympic torch. Just saying.

 

[Soapy Sam]

Look, never mind the numbers.
Just don't do it.
OK?

 

[robinson]

So you're saying that the heat energy over an 8mm area from direct sunlight is well over 555 degrees F????

I think your maths is a bit wonky somewhere!

Oh, and a mirror of about 12" is used to light the Olympic torch. Just saying.

My calculations must be off.

Must. have. coffee. can't. think.