An International Peer Reviewed Research Journal

AJP

SSN : 0971 - 3093

Vol 31, No 1, January, 2022


Asian


Journal of Physics

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Volume 31                                                                     No 1                                                                   January 2022

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A Special Issue in the Memory
of
Late Prof B N Gupta


Guest Edited By : R S Sirohi & A K Nirala


Anita Publications
FF-43, 1st Floor, Mangal Bazar, Laxmi Nagar, Delhi-110 092, India

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Asian Journal of Physics                                                                                                       Vol. 31 No 1, 2022, 1-16


On the methods to determine the focal length of an imaging system: A tutorial approach


Rajpal S Sirohi

Alabama A&M University Normal, Alabama, USA

This article is dedicated to late Prof B N Gupta

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Focal length of an imaging system is an important parameter as it determines its gathering power, numerical aperture and resolution. Its determination becomes very difficult as one of the planes is not physically accessible. A number of methods have been developed that measure either the effective focal length or the back focal length. The objective of the present paper is to discuss various methods that have been investigated and reported in the literature. © Anita Publications. All rights reserved.

Keywords: Focal length, Radius of curvature, Nodal slide, Interferometry.

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On the methods to determine the focal length of an imaging system: A tutorial approach.pdf
Rajpal S Sirohi

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