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Revista Brasileira de Ensino de Física

Print version ISSN 1806-1117On-line version ISSN 1806-9126


SILVEIRA, Fernando Lang da  and  AXT, Rolando. A recurrent problem in geometrical optics: a not perceived image discontinuity at the magnifying glass. Rev. Bras. Ensino Fís. [online]. 2006, vol.28, n.4, pp.421-425. ISSN 1806-1117.

Could we be looking at an object across a magnifying glass without perceiving the sudden image inversion - from virtual and erect to real and inverted - when the object moves away from the lens to a place a little farther than the focal distance? In this article we show that this effectively happens, as well with some eyeglasses lenses, like common reading glasses.

Keywords : magnifying glass; human eye; geometrical optics.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


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