Re: Laser light

[pengra@whitman.edu (Jim Pengra)]

> To support this argument have
> two different people look at the same white surface.   If you can arrange it
> have one near-sighted person and one far sighted person.  Have both
> simultaneously move their heads from left to right.  As the near sighted
> person moves his/her head from left to right the he will see the pattern
> moving in a direction opposite the motion of the head and the far sighted
> person will see the pattern moving in the same direction as the head.

    Another interesting aspect of the pattern is the relationship between
the apparent distance between the spots and the resolving power of your
eye. If you view the pattern through a pin hole in card the speckle pattern
is much more coarse, or the spots are more widely spaced. Likewise, if you
view the pattern from a short distance the spots seem quite close together.
The angular resolution of your eye is related to the aperture (pupil)
diameter.




--Jim(pengra@whitman.edu) Walla Walla, Washinton, USA