Re: Magnesium Flouride

[Bob Sciamanda <trebor@VELOCITY.NET>]

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
transformer".

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
http://www.velocity.net/~trebor/
trebor@velocity.net
----- Original Message -----
From: "David Abineri" <dabineri@CHOICE.NET>
To: <PHYS-L@lists.nau.edu>
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
> visible spectrum?
>
> Thanks for any comments on this, I am an optical novice.
>
>     David Abineri
>
>
> --
> David Abineri
> dabineri@choice.net