Physics Help Forum Refraction of light

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 Oct 14th 2013, 05:55 AM #1 Junior Member   Join Date: Oct 2013 Posts: 1 Refraction of light Hello, I am in final year studying product design. I am currently in the process of having my project approved. My project proposal is about treating jaundice in developing countries where communities have a lack of electricity. Jaundice can have devastating consequences if not treated such as brain damage and death. However Jaundice is a simple condition to treat by a process called photo therapy, this is by shining a blue light (wavelength between 450nm and 470nm) onto the skin. My proposed solution is the use of a prism and visible light. As the light is refracted it is separated into the spectrum, this is where I could isolate the specific blue light to treat jaundice. The products that are used in hospitals use LEDs which have the intensity of 12-30 mW/cm2/nm. After I have isolated the other wavelengths apart from the blue, would the sun be able to provide this intensity? Thank you )
 Oct 14th 2013, 08:26 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,347 From this article: http://www.newport.com/Introduction-...3/content.aspx figure 3 indicates that at the top of the earth's atmosphere the value for the sun's irradiance at 460 nM is about 1.4 W/m^2/nm. This converts to 0.14 mW/cm^2/nm, which is significantly below the value you are looking for. In addition if you consider the filtering and scattering effects of the Earth's atmosphere by the time the light reaches ground its power is somewaht reduced, especially in the blue spectrum (which is scattered to a greater degree than red). So I wouild say that for this to work you would need some sort of mirror to concentrate the sun's light and a very good filter to remove all but the most important part of the spectrum around 460 nM to prevent injury.
 Dec 18th 2013, 04:23 AM #3 Junior Member   Join Date: Dec 2013 Posts: 1 I had gone through the posts. The Way, Which you explain about your project is good. The specified blue light will treats the jaundice. Can you please share me some more attachments about the topic in detail view. I am eagerly waiting to know it with some video's. __________________ optical design optical modeling software

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