Date: Thu, 13 May 2010 10:25:16

Author: Thomas Senior

Subject: Re: Fresnel Lenses on Vehicles

Post:

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To improve visual field, one uses a diverging fresnel lens, which does not focus the sun's image, but spreads out the sun's light, so no chance of fire as far as i understand it.

Tom



________________________________
From: George M. Caplan
To: tap-l@lists.ncsu.edu
Sent: Thu, May 13, 2010 11:13:39 AM
Subject: [tap-l] Fresnel Lenses on Vehicles


Today I saw a van with a Fresnel lens on the back window. Although this lens might provide an improved view for the driver, I have heard that it can also focus sunlight into the van and start a fire. I haven't been able to find much about this on the Web. Does anyone know of cases where this has happened?



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To improve visual field, one uses a diverging fresnel lens, which does not focus the sun's image, but spreads out the sun's light, so no chance of fire as far as i understand it.TomFrom: George M. Caplan To: tap-l@lists.ncsu.eduSent: Thu, May 13, 2010 11:13:39 AMSubject: [tap-l] Fresnel Lenses on Vehicles









Today I saw a van with a Fresnel lens on the back window. Although this lens might provide an improved view for the driver, I have heard that it can also focus sunlight into the van and start a fire. I haven't been able to find much about this on the Web. Does anyone know of cases where this has happened?








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