From: Ed Stander (glassact@compuserve.com)
Date: 05/05/00-05:58:19 AM Z
Replies:
1) The inverse square law applies whenever a light source spreads out with
distance, as it does with enlargement. The idea is that a 1x1 inch square
of light becomes a 2x2 inch square of light when you double the distance
to the paper. A 2x2 inch square of light is 4 times the area of the
original square. Each 1x1 square therefore receives 1/4 the original light
- and needs 4x the exposure to compensate.
2) Light is a continuum. Gamma rays, X-rays, UV light, Visible light, IR
light, Microwaves, and Radio waves are all the same thing at different
frequencies. Thus I see no problem calling UV a light. Cheers, Ed
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