http://www.greenpowerscience.com/
This is a video illuminating the focal point.
Duration : 0:7:50
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February 28th, 2010 at 5:27 am
What would a laser …
What would a laser beam do through a fresenel? hmm…
February 28th, 2010 at 5:27 am
After about 6:44 …
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?
February 28th, 2010 at 5:27 am
Great videos by the …
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
February 28th, 2010 at 5:27 am
HElp
where can i …
HElp
where can i get a book about this (Green power science) or green energy so called.
any info please reply thinks vary much.
February 28th, 2010 at 5:27 am
Thank you:-) Keep …
Thank you:-) Keep in touch and share our videos.
Kind Regards
Dan
February 28th, 2010 at 5:27 am
this man is great.
…
this man is great.
i subscribe it
i rated it
what else can we do to show support?
February 28th, 2010 at 5:27 am
Thank you for this …
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.
February 28th, 2010 at 5:27 am
Thanks Dan I am …
Thanks Dan I am learning alot on this video.
Debugspray
February 28th, 2010 at 5:27 am
Hey Dan have you …
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
February 28th, 2010 at 5:27 am
hey dan thanks for …
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
February 28th, 2010 at 5:27 am
can you use car wax …
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?
February 28th, 2010 at 5:27 am
I enjoyed your …
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.
February 28th, 2010 at 5:27 am
Great explanation. …
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.
February 28th, 2010 at 5:27 am
It’s a stock music …
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”.
February 28th, 2010 at 5:27 am
Great focal point …
Great focal point demo. What was the music playing in the background ?
February 28th, 2010 at 5:27 am
Don’t stop making …
Don’t stop making these videos a learn something new everytime!
February 28th, 2010 at 5:27 am
Excellent way to …
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.
February 28th, 2010 at 5:27 am
Wow!!!!!
… 
Thank you very much!!!!!!
Wow!!!!!
February 28th, 2010 at 5:27 am
You would make a …
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.
February 28th, 2010 at 5:27 am
This brings back …
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.
February 28th, 2010 at 5:27 am
Very illuminating !
Very illuminating !
February 28th, 2010 at 5:27 am
Coool
Coool
February 28th, 2010 at 5:27 am
I agaree with you …
I agaree with you on that. Thank god for you tube
February 28th, 2010 at 5:27 am
thank you for this, …
thank you for this, you read it in the books all your life but its a different thing to see it shown like this.