www.greenpowerscience.com This is a video illuminating the focal point.
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23 Responses to FRESNEL LENS PARABOLIC MIRROR FOCAL POINT FOCAL LENGTH SOLAR POWER ALTERNATIVE ENERGY HID LIGHT
so awesome
thanx 2 to autoplay i am enjoying series…dunno how many yet to see….great presentation…very explanatory no insult 2 intellect, great humor, exciting & informative demonstrations…rock on mr. n mrs. rojas (sp?)
that was coo
Tip: use smoke to make light paths visible. It does not go away as quickly as water spray, and it wil not affect the lens/mirror surfaces.
great demonstration man!
if you put the fresnel lens in between the mirrorwill it make that bat man brighter?
its explained in detail in the standard physics II class. just look up lenses/mirrors and refraction and whatnot
you can even calculate the curvature required of a mirror so that an object behind the mirror looks like its closer to you than the lens itself
enjoy
This video is fantastic. Best video of its kind. I read the book for hours and it didn’t really click until I watched this video. I’m self studying physics so I don’t have a teacher or lecturer or other students to ask questions when I don’t understand something.This stuff is brilliant. You are now my new physics teacher.
I rate this video awesome
Great demo to show the focal point
thanks a lot to explain that dan, i really loved the video,,,, i like the way you explained… Excellent….
Take some algebra 2 -_-
Nice idea with the spray for illustration!!
Is that a frog in the background?
5 stars
What would a laser beam do through a fresenel? hmm…
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?
HElp
where can i get a book about this (Green power science) or green energy so called.
any info please reply thinks vary much.
Thank you:-) Keep in touch and share our videos.
Kind Regards
Dan
this man is great.
i subscribe it
i rated it
what else can we do to show support?
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.
Thanks Dan I am learning alot on this video.
Debugspray
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
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
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.
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.