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walt r
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Reged: 02/13/07
Posts: 3524
Loc: Doylestown, PA
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Re: Novice optics question
09/30/09 03:48 PM
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Yes it could.
The 'focal' length will depend on the curvature of the entrance surface and the refractive index of the glass (assuming air to glass interface).
This is also what really happens at the air to glass interface of any lens. In simplified optics instruction most lens are considered "thin" and the total curvature only is considered. In reality, a lens will have two air-glass interfaces, one when the light 'ray' enters the glass air -glass) and a second when the 'ray' leaves (glass-air) the glass. In your example the lens is so thick that the rays come to a focus before exiting.
The classic physics book problem uses a glass sphere or a glass rod with curved ends.
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Walt
Obsession 18" f/4.45 #1370 AN/SC
MK67 Deluxe 6" f/12 Mak-Cass, Super Polaris GEM, JMI MicroMax DSC
DIY 60mm f/6 Achromat
Cookbook 245 CCD
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