title: Simple portable lens meter.
abstract: A device measuring the optical power of simple lenses by means of moiré phenomena is described. The relevant equations are derived, and a working instrument is presented. A power measuring accuracy better than 0.25 m(-1) in the range of +/- 10 m(-1) is demonstrated.
authors.affiliation: Laser and Fibre Optics Centre, Department of Physics, University of Cape Coast, Cape Coast, Ghana.
authors.forename: Paul K
authors.initials: PK
authors.lastname: Buah-Bassuah
authors.forename: Bruno
authors.initials: B
authors.lastname: Tiribilli
authors.forename: Massimo
authors.initials: M
authors.lastname: Vassalli
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Molesini