Gravitational Lensing with Wineglasses
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Scan day: 09 February 2014 UTC
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Description: Explains how gravitational lensing can be simulated using wine glasses as (unusually-shaped) glass lenses. Includes images and diagrams to explain the different phenomena gravitational lensing can produce. By Phil Marshall (Stanford University).
Gravitational Lensing with Wineglasses Gravitational Lensing with Wineglasses Gravitational lenses are aptly named: massive objects focus (albeit badly) light rays towards us astronomers. They are not well-designed lenses - they suffer from all possible optical aberrations except chromatic - but their behaviour can be understood and used for astrophysical studies. In fact, we can take the mass distribution inferred from, for example, a strong galaxy-scale gravitational lens and work out what its effective refractive index is. We can then translate this into the thickness of glass you would need to get the same lensing effect: the answer you get is a shape very close to that of the base of a wineglass.
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| Date | activated: 04-Oct-1985 last updated: 07-May-2009 expires: 31-Jul-2014 |