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Thread: Need help

  1. #1 Need help 
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    A thin layer of material is sometimes placed on eyeglass lenses to reduce reflections. Explain the physics of these transparent coatings.

    I have no idea what's going on here. Please help.
    What's the topic of physics involved here?
    Thanks


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  3. #2  
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    google anti-reflective coating


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  4. #3  
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    the thin layer is light absorbant , thus little reflection.

    light is absorbed by the thin layer , and possibly diffused within the layer.
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  5. #4  
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    These thin layers reduce reflected light by interference. Light reflected from the top of the layer interferes destructively with light reflected from the bottom of the layer thereby reducing the intensity of reflected light. There will be a corresponding increase in the intensity of transmitted light. A single layer will prevent reflection only over a narrow range of wavelenghts.
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  6. #5  
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    Quote Originally Posted by Old Fool
    These thin layers reduce reflected light by interference. Light reflected from the top of the layer interferes destructively with light reflected from the bottom of the layer thereby reducing the intensity of reflected light. There will be a corresponding increase in the intensity of transmitted light. A single layer will prevent reflection only over a narrow range of wavelenghts.
    there is something interesting about what this thread contains.

    light is being , slowed down effectively as it passes through the thin layer.

    resulting in light traveling slower than c as we now have determined.

    just thought I wanted to mention that , I hope it doesnt start a snowball.

    what did you think about the cessium experiments?
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