Espinosa, Julián, Pérez Rodríguez, Jorge, Hernández, Consuelo, Mas, David, Vázquez Ferri, Carmen Measuring the effective focal length and shape factor of a thick lens using a microscope Optik - International Journal for Light and Electron Optics. 2015, 126(19): 1965–1969. doi:10.1016/j.ijleo.2015.05.044 URI: http://hdl.handle.net/10045/47054 DOI: 10.1016/j.ijleo.2015.05.044 ISSN: 0030-4026 (Print) Abstract: The optical power of a thick spherical lens and its Coddington shape factor are essential magnitudes that characterize its image quality. Here, we propose an experimental procedure and apparatus that allow accurate determination of those magnitudes for any spherical lens from geometrical measurements. The performance of the technique and the used instruments are simple since it only requires a microscope and an optical mouse. The propose overcomes the drawbacks of other devices that need of the refractive index or may damage the lens surfaces, like spherometers, and provides similar results to those from commercial lensmeters. Keywords:Thick lens, Effective focal length, Shape factor Elsevier info:eu-repo/semantics/article