[Greenbuilding] Fresnel lenses box solar cooker

[sanjay jain]

Hi all,

Do the fresnel lenses in this box really help?

http://www.ebay.com/itm/Made-in-USA-plastic-Plexiglas-3D-Fresnel-Lens-Collapsible-Solar-Oven-Cooker-/251281362842?pt=LH_DefaultDomain_0&hash=item3a81894f9a

~sanjay
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