February 3rd, 2010 . . . . . . . . . . .
Categorized under: Alternative Energy

FRESNEL LENS PARABOLIC MIRROR FOCAL POINT FOCAL LENGTH SOLAR POWER ALTERNATIVE ENERGY HID LIGHT







www.greenpowerscience.com This is a video illuminating the focal point.

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Comments

  1. What would a laser beam do through a fresenel? hmm…


    pvampire
    February 3rd, 2010

  2. After about 6:44 this video gets awesome! A million little fireflies doing a choreographed dance in the light. Science can be beautiful!
    BTW Dan, when you lengthen out the focal point like that, does the concentrated energy drop off? (spread out?) Does this make a good argument for keeping a focal length short?


    canamm
    February 3rd, 2010

  3. Great videos by the way.
    Hey which is more efficient a frenel lens or a parabolic mirror? Also what is the useful life expectancy of both?

    Thanks


    sfjohnston1001
    February 3rd, 2010

  4. HElp

    where can i get a book about this (Green power science) or green energy so called.

    any info please reply thinks vary much.


    leeyoutube
    February 3rd, 2010

  5. Thank you:-) Keep in touch and share our videos.

    Kind Regards
    Dan


    GREENPOWERSCIENCE
    February 3rd, 2010

  6. this man is great.

    i subscribe it
    i rated it

    what else can we do to show support?


    leeyoutube
    February 3rd, 2010

  7. Thank you for this video. It was simple like all great ideas. My suggetions – I noticed that the light is dispersing after the focal point. Please try to use this light after the focal point – for example by fixing second fresnel lens in the opposite direction. The hope is ti will increase the power of the focal point.


    vchristov
    February 3rd, 2010

  8. Thanks Dan I am learning alot on this video.
    Debugspray


    debugspray
    February 3rd, 2010

  9. Hey Dan have you ever put a frensel lenz against a mirror and shorten the focal length? Its cool and useful as a magnified mirror as well. I didnt know that you could lengthen the focal point by wetting the grooved side though. thanks for the ideas in my head. you could use this technique as a timer as the lens dries.
    MUDDy


    muddymuddymuddmann
    February 3rd, 2010

  10. hey dan thanks for my ideas on this flashlight focus and million candle lenses making one of my own as soon as i find mines glad you liked my idea


    narcovice
    February 3rd, 2010

  11. can you use car wax instead of wetting that side? car wax will fill the grooves also and be more permanent. maybe u should try it? who knows?


    hrvatwrestle
    February 3rd, 2010

  12. I enjoyed your video pretty much!

    It was a smart idea to do this at night with the use of carlights, instead of having your hands burnt during the day by the sun.


    321ozzy
    February 3rd, 2010

  13. Great explanation. I didn’t realize there was a difference in the smooth/rough sides of a fresnel lens. I’ll be experimenting with that.

    I’m thinking that with a gimbaled hour-hand clock mechanism for sun tracking, a copper coil boiler at the focal point, and a steam engine driven permanent magnet alternator…

    Hmmmm…you get my point.


    luvofcountry
    February 3rd, 2010

  14. It’s a stock music sample/sound effect that comes with programs like iMovie, GarageBand, and Final Cut Pro. Basically if you have a Mac you have that “song”.


    ToolshedEd3TF
    February 3rd, 2010

  15. Great focal point demo. What was the music playing in the background ?


    naisayd
    February 4th, 2010

  16. Don’t stop making these videos a learn something new everytime!


    sonofhendrix
    February 4th, 2010

  17. Excellent way to show the fp. The water spray at the end was neat as well. I agree with darkvader47.. you would make a good teacher.


    ReisendeEuropa
    February 4th, 2010

  18. Wow!!!!! :-) Thank you very much!!!!!!


    GREENPOWERSCIENCE
    February 4th, 2010

  19. You would make a good science teacher, and I wouldn’t be bored at all. I’m a professional photographer and you’ve taught me more about Focal Length than I ever understood in photography class, honestly.


    darkvader47
    February 4th, 2010

  20. This brings back memories of Physics labs, where we found the focal length by using the reflection method. This way is far much cooler. Write a book Dan please do.


    MinTrinidad
    February 4th, 2010

  21. Very illuminating !


    JavaLessons
    February 4th, 2010

  22. Coool


    SylwerDragon
    February 4th, 2010

  23. I agaree with you on that. Thank god for you tube


    tbenefi33
    February 4th, 2010

  24. thank you for this, you read it in the books all your life but its a different thing to see it shown like this.


    sugarbaby45
    February 4th, 2010

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