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optics - How to determine the focal length of a lens that is equivalent to two lenses? - Physics Stack Exchange
Derive the expression for effective focal length of two thin lenses kept in contact. - Sarthaks eConnect | Largest Online Education Community
i) what do you mean by the equivalent lens? Derive an expression tor the equivalent focal length of system of two lenses placed at a certain - Sarthaks eConnect | Largest Online
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Table of Equivalent Focal Lengths for APS-C sensor: Beginners Questions Forum: Digital Photography Review
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