A guy who calls himself grant thompson used a fresnel lens from a dismantled old toshiba projection tv and shows the world on youtube how his diy solar concentrator can scorch nearly anything from pennies and concrete to eggs.
Fresnel lens and solar panel.
Such a lens can focus light on a small spot but does not produce a sharp image.
A fresnel lens is a lens with multiple refracting planes designed to improve the concentration of light coming from many different angles onto a single point or line.
A non imaging spot fresnel lens uses ring shaped segments with cross sections that are straight lines rather than circular arcs.
By concentrating solar power onto solar cells they can increase the amount of sun striking the solar cell and allow a relatively small amount of silicon photovoltaic pv material to be used in large solar panels.
These lenses have application in solar power such as focusing sunlight on a solar panel.
Fresnel lens using sunlight to heat water in water bottle.
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