http://en.wikipedia.org/wiki/Fresnel


I was fascinated when I learned of this type of lens as well as the person who invented it. I did not find many videos that I thought where Vs quality, but this one passed the exam. There are not how its made, how it works or anything on these lenses, you just have to read on them pretty well. Really neat though.

smells like bawbawcue

you can catch it on fire long enough to... actually make something catch it on flame for a long time, watch this.

SMELLS LIKE BAW-BAW-CUE!

There's something magical about seeing kids so excited about science! *quality

Boosting this quality contribution up in the Hot Listing - declared quality by Fusionaut.

HAha - the little guy has a future on the shopping channel if he wants it:

"And it works on sticks, too!"

[redacted]

I hate that kids can't say their r's. I couldn't either...it's weally stwange.

>> ^rottenseed:

I hate that kids can't say their r's. I couldn't either...it's weally stwange.


Ditto. And it's bofe of dem. The big kid really loved to bone his wood, though.

Baby talk, baby talk. It's a wonder you can walk.

Tags for this video have been changed from 'Fresnel lense, projection tv, kids, science, fire, focus, sun, combustion, ignition' to 'Fresnel lens, projection tv, kids, science, fire, focus, sun, combustion, ignition' - edited by lucky760

>> ^Mcboinkens:

The most obvious question in my mind is what happens when you put an arm under it? I imagine it won't light up in flames, but it would probably induce a pretty serious burn, no?


I have a much smaller lens around here somewhere, about 6" diameter, that will also ignite anything you put under it pretty much instantly. It's a focusing lens from a spot-light that was salvaged out of an old theater.

My neighbor in high school, who was probably about as stupid as these kids are, told me he wanted me to focus it on his shoulder. He was certainly old enough to know what was going to happen, so I had no qualms in obliging him. The moment I brought it into focus, his shirt caught fire and he dropped to the ground screaming. There were no marks on his skin, just some redness.

Once he had recovered (and extinguished his shirt), he told me to do it again and said he wouldn't move this time. I was focusing on bare skin this time, so there was no shirt ignition. His skin did blacken within a few seconds, though, and a thin stream of smoke began to pour off of him, just as it does when you burn wood. He lasted maybe 4-5 seconds at most before he dove to the ground in agony again.

Did I mention he was pretty stupid?

[redacted]

>> ^rottenseed:

I hate that kids can't say their r's. I couldn't either...it's weally stwange.


A lot of kids can't do R or TH sounds properly till 2nd grade or something. A lot of ESL students never get those ones right.

Quick! Get the Cat!

Parentally sanctioned pyromania. Cool!

I thought the screen of a projection TV was a white bed sheet hung on a wall.

>> ^messenger:

I thought the screen of a projection TV was a white bed sheet hung on a wall.


Front projection/Rear projection. This would be one of the differences between the two.

If you listen closely at 1:48, you can hear the solitary ant that discovered what that shiny patch on the ground was.

Yea that Barbecue pronouncing kid is hilarious, I never really noticed how fixated on it he is until I really noticed the ending. He should be a new remix mime.

I like turtles

Smellsl ike bbq

I IIiiii

Iii
like turtles

smells like bbq
bb
b
bbq

Wow this is really cool.

I play with infrared lasers sometimes at work;
we have a burn mark in one of the computer displays from another person not being careful;
good reminder of the power of a concentrated beam of light

put a giant lens in orbit -- next best thing to a death star.

>> ^jwray:

put a giant lens in orbit -- next best thing to a death star.


This!

I'd love to see some random places get burned! It's like winning the lottery, but with death.

They better not burn ants!

>> ^ant:

They better not burn ants!


stepping on them is quicker and more productive.

>> ^BoneRemake:

>> ^ant:
They better not burn ants!

stepping on them is quicker and more productive.


Bah!