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These are anti-reflection coatings. The purpose is to minimize loss of
incident light energy due to reflections at the air-glass interface.
Sophisticated lenses will have a multiple-layer anti-reflection coating.
Their frequency response can be engineered to be sharp or broad, as
required. Apropos' to a recent thread, this technique is viewable as
maximizing optical energy transfer (air to glass) by an "impedance
Physics, Edinboro Univ of PA (Em)
----- Original Message -----
From: "David Abineri" <dabineri@CHOICE.NET>
Sent: Saturday, February 14, 2004 7:04 PM
Subject: Magnesium Flouride
In high school optics we frequently do problems involving a thin film of
Magnesium Flouride on a lens to enhance the tranmission in the middle of
the visible spectrum because of a lack of sensitivity by the film (I
hope I have this right).
What about digital cameras? Do their lenses need any form of such
correction or are the photo arrays more uniformly sensitive across the
Thanks for any comments on this, I am an optical novice.