From: Mark Holm 
To: atm{at}shore.net
Reply-To: Mark Holm 


> 5.93244 millionths of an inch for P-V error, or about about 1/4 wave  (
> using lambda =22.5 millionths inches)


Sorry, thats not right.  Plop does everything in millimeters.  It doesn't
even have an option for inches.

Read it as:
Visible P-V error: 5.93244e-06 mm
Visible RMS error: 8.44784e-07 mm

That is about 1/84 wave P-V and 1/592 wave RMS.  Plenty more than good enough.


To get waves, you have to divide by the wavelength of light.  I use 500 nanometers,

others use 550 or similar.  500 nanometers = 500e-9 meters = 500e-6 mm = 0.0005 mm.


So divide 5.93244e-6 by 500e-6.  The e-6 parts cancel, so you have 5.93244/500
=
0.01186488  and 1/0.01186488 = 84 and change which is where I get the 1/84
wave mentioned above.

Mark Holm
mdholm{at}telerama.com

--- BBBS/NT v4.00 MP