homework and exercises - Inserting thick lenses into a thin lens system and deducing values - Physics Stack Exchange
Gaussian approximation
Thin Lenses - Geometrical Optics - MCAT Content
4.5: Thin Lenses - Physics LibreTexts
2/9/15 Oregon State University PH 212, Class #161 The Thin-Lens Equation The thin lens approximation holds for a lens whose thick- ness is small compared. - ppt download
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How to use the Thin Lens Formula to model a thick lens -- PanoHelp.com