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Re: [Phys-l] FW: Science show "Humanly Impossible" on NationalGeographic channel.



Dilated pupils --> larger aperature... What happens to SHARPNESS? Go play
with a pinhole camera, or look at the lens and f/stop settings on your SLR
camera. Or better yet, draw some ray diagrams comparing large and small
aperature openings.

Sam

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu
[mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Michael
Meyer
Sent: Wednesday, November 18, 2009 9:14 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] FW: Science show "Humanly Impossible" on
NationalGeographic channel.

John Clement wrote:

"Dilate means to make larger, so pupils do the opposite to sharpen vision.
Remember the optometrist dilates the pupils to be able to look inside the
eye. But pupils dilate when you see something of interest which increases
the amount of light at the same time the sharpness is decreased."

Is "sharpness" here equated with angular resolution? If so, wouldn't a
larger pupil/aperture result in better resolution?

Mike Meyer
Lecturer/Lab Coordinator
Michigan Tech University
mrmeyer@mtu.edu
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