Originally Posted by daletom
I'm thinking of an organ on the human body. This organ has the remarkable ability to radically change its size in response to stimulation. Under certain conditions it can increase to 6 or 7 times its size under other conditions! Can you name the organ, and describe the stimulation that brings on the change in size?
Originally Posted by Tiay
well, it's not penis, that's for sure, that'd just be too obvious.
Too obvious?? Since it's the first thing you mention, I'd say it's pretty obvious that YOU have a DIRTY MIND!
And, young lady, . . . If you expect it to increase by
6 or 7 TIMES you are going to be VERY disappointed. At the least, you are greatly over-rating your abilities.
ah. the pupils? And the stimulation is light... are eyes organs though?..
well.. I don't know, what is it? It better not be something obscure!
Excellent response! (Should I add, "Especially from a MAC user?"
) Yes, the dark-adjusted pupil opens to around 6 or 7 millimeters in diameter. When stimulated by light, it closes down to about 1 mm or a bit less - a change in (linear) dimension of 7 fold. (In terms of area, it's even more dramatic - in the range of 30 to 50 times. Now a girl who could get that kind of response from her boyfriend would REALLY have something to brag about!!!)
And that's what makes the 7x50 binoculars such an excellent instrument for amateur astronomy and other low-light situations. They gather light over a 50mm aperture and compress it down to a 7mm aperture. This (7mm) is the largest size that can be accepted by a fully dilated pupil. In the process - as you recall from introductory physics - the image size is magnified, but it's the light-concentrating effect rather than the magnification that makes "invisible" objects in the sky (or battlefield, or game preserve) very obvious when you train the field glasses on them.
Dale
