A4 high power magnifying glass

[vampov]

It would be a nice to try and build a grid of Thermocouples with those concentrating the sun on them.

[TheCrazykronic]

Perfect for bong hoots =3

[truesivad]

Darth Vader wants to seize control of that for his new Death Star

[ganirene]

OH NOOOOOOOO!!!!!!MY EYES ARE BURNING

[wolfsledgend]

i got one smaller than that but its 5mm thick so it dosent bend and every single bit of light gets concentrated onto a spot about 2mm across :D melted some rocks in my backyard thank god for the Australian hot sun. this thing literally made wood catch on fire instantly.

[rathat48]

I have a 50 inch one from an old projector tv, I put together a wood frame. This thing melts coins. I got it on ebay, there is a store that sells them to do solar powerd cooking.

[jephboy]

Isn't that just a fresnel lens?

[1xDRCx]

type in solar death ray, kip kay got a magnifying glass like this, only the size af a large flat screen TV, it melts stuff instantly.

[XxstryaexX1]

hey can ants melt under a magnifying glass? cuz i just killed one on my "fake wood"(soft rubbery things) and the head seens to come off and now theres a red/yellow dot that looks alot like a pimple on my floor

[TheBiscuitjar]

Question:

Could you rig a parabolic mirror, have the focal point to the circumference of the secondary magnifying optic and therefore amplify said parabolic reflection exponentially to the initial heat reading.?

[iminyourbasement]

you can buy a slightly bigger one at officemax for 8 dollars

[physicmad]

@iminyourbasement this was quite an old one lol - just get hold of some old over head projectors. Some of those lens have high ring densities, so high infact that when the reflection mirror is left closed when the light is left on actually burns and melts the plastic casing around the mirror XD!!!

[kilerngbayan247]

where did u get tht?

[physicmad]

@kilerngbayan247 my late aunty gave it to me and my bro when we were around 4 foot tall - not knowing the power of the lens at the time, me and my bro had the funiest of times. One scenario had us around an old metal collender with dried leaves and wood - 10 seconds later it had about two industrial sized bags of sand on it. Gooooood times.

[iwillavengeyou]

where did you obtain that from?

[myshivam]

where did you get that from?

[danieljordanpatrick]

could you magnify the beam from a magnifying glass with another to get an even more powerful/concentrated one?

[physicmad]

@danieljordanpatrick yes that is possible but if you try it with 2 freznel lens you would burn / melt the second one trying to focus further lol - just use a standard magnifying glass if you want to evoke a secondry focus.

[kilerngbayan247]

@physicmad lol ur auntie is cheap!!!! if u get a tv and get the glass thingy on the front.... they could be a giant magnifying glass

[metallica250000]

justin beibr is gay fag who cant sing because hes a litle girl but cool laser vid!

[fiirefliesx3]

haha sickkk.

[youronlycow]

thats not instant.

[Gustavo0929]

is the magnifying glass ridged one one side of it, cause if it is those magnifying glasses are made of plastic and worth one dollar

[TheMixerVideoGuy]

is that glass? omg that would shadder if u droped it lol

[physicmad]

well its not made of glass - its a typical speculation that is second nature to all of us, we see somthing we assume its a "magnifying glass". its made of plastic (same stuff they use in OHP's) but it can easily shatter like a CD. its allready got a crack and chip near one of the corners.

[youtubalisation]

we can use that to generate electricity

[maslabud]

It's called solar pannels. lol man come on.

[kwbassacoustic]

Apparently instantly is 20 seconds

[physicmad]

that 20 seconds was taking me to focus it correctly... the lens is old and has alot of scratches

[maslabud]

so where can i get one of these lens

[zker666]

thats a fresnel lens smart one

[FDude11111]

stop burning your house!!

[SthealthRaider]

OHNOOES you shed is burning

[shiv317]

dam i want 1

[Kerblamowz]

I have a small magnifying glass that's actually better than that. It's just impossible to get a good focus with that lens you have.

[narcovice]

i sell a whole bunch of these lenses for 5 dollars each they scratch real easy the soft circles but it burns very fast

[galen1106]

where do you live? a junkyard?

[tainterlakeisgreen]

that made me a chuckle :)

[ShikamaruXX51010]

hahah

[mercanaries3]

450mw of laser power or more cuz 250mw of laser power doesnt boil watter

[eemaankhan]

wats an A4?? somebody help

[fibiger12]

its the size of ordenary copy paper

[taw10fiq]

lol its not high powered a normal magnifing glass can do that no dout

[speedstakerguy]

is the bigger the lense the hotter the spot is? and what if u use a 30x jewelery magnifying glass?

[eemaankhan]

i read somewhere, yea, like, a magnifying glass about 10 feet in diameter was used to point at a diamond, like hundreds of years ago in Europe, to prove diamond is carbon, and it burned the diamond into carbon, so i guess te bigger, the better ....?? i tihnk so

[GarryXFG]

Yeah, the bigger the MAGNIFYING GLASS the better. But your focus point has to be as small as possible.

[basilenglish]

this is a fresnel lense???

[magicster123]

everyone does konw that you can get it from a dollar store, right?

[magicster123]

sorry know*

[Northkey]

Instantly boil water wow what a joke...your dumb dude

[Jokomoright]

No you what you need is a Magnifying glass out of a big screen or plasma tv.The that is behind the screen.I can start instant flames in less than 5 seconds on wood!I will make a video tomorrow to show you.

[razielvampire666]

thats awesome .. id loves to strap a chav down selotape his eyes open and just burn them out muhahaha

but nah ill stick to my laser you can use it to survive in the winter where theres no sun ;)

[mercanaries3]

lololol

[Dan1234111]

can a magnifing glass melt steel or like a bbq grill

[HomesliceDrummer]

not hot enough. I'm curious as to see whether multiple magnifying glasses can be placed in series in some way to create an extremely hot laser to be able to weld steel.

[xraysatilite]

ya i was just thinking around the same lines but more like a solar stove or heater

[woodlauncher]

Dont think that would work..

[DontFlag]

they do laser cutting in mass production settings. never heard of welding though, a plasma arc welder will do a pretty good job of that, so there isn't much reason to develop such a thing. Cool thing about laser cutting is that, unlike other methods, there is no heat warpage.

[VVLaserTechnology]

Um... focused sunlight is not a laser.

It is not coherent.

[HomesliceDrummer]

laser-like, better?

[VVLaserTechnology]

Yes, because it is easier to focus and the waves move in step with eachother.

[KurtisWM]

I dont think it could ever melt metal through a magnifying glass, even if you tried multiple lenses because it would be way to hard to get them all focused

[Extremehackermike]

Omg thats a freking reading fresnle lense....

[starsoffyre]

Its a fresnel lens.

[treebox1]

i bet that it wasent instant boiling or instent any thing i bet he stood there for 5 mins to get it to do that

[amalsbury]

I am not being mean at all. But the water didn't really boil, and it was not instant?

[amalsbury]

I am not being mean at all. But the water didn't really boil, and it was not instant?

[coffeeisfunny]

how about getting A LOT of supermart-type laser pointers and pointing the beams at an obect thru that magnifying glass??

[appppppppple]

a laser wouldn't work with that magnifying glass, all magnifying glasses do to burn stuff is concentrate all the light into one space. That's why when you try burning ants you try getting a narrow beam of light because all the light is stacked in one place, so a narrow laser beam would just stack by itself in the same place and wouldn't concentrate a lot of heat since there is only one narrow beam of light. It would only work if you had a lot of laser pointers to concentrate.

[tjking86]

why don't you focus a laser with it?

[physicmad]

a laser would burn better with a shorter focal range since the diameter of the beam is small and the beam is coherent. sun light is non coherent and dispersed in all directions and the collection area has to be greater to take affect. plus the Fresnel lens's ridges are like record groves they woudn't focus a laser properly. (plus its scratched)

[spoon527]

yea lazer pointer better cuz u enmie can fly and it takes about half the day night and clouds lazers no care they have no enimies

[mapleslayer2]

you use it wrong its sopost to be just a circle

[redeyesthe20th]

yeah try lie a 5' one that'll hit litral millions of degrees

i looove frasnel lens!! ^_^

[ashcroft8]

Couldn't this be used to desalenate water???

[luisbaltazar1]

indeed, a common magnifying glass lens (spheric lens) can concentrate the sun light up to about 2,7 times the energy per unit of area of a 300mW laser. (that is in a sunny 1000W/m² day, and only if you focus the light properly)

but the light in this video is very, very poorly focused... not even close to the energy density of a laser... even a weak one.

[LINKdrkguy]

lol, learn how to focus, then post it

[TiikerinKarva]

Arsenists tools.

He was burning somebodys house there.. :D

[bugattidude]

holy crap... thad b fun 2 burn bugz with...lol....

[bexiang67]

Anyone who gets one of those should also get some good eye shades or a peice of welding glass if they want to experiment easilly. Its dangerous like a laser. A square meter has about 1000W of energy. So a 1 sq foot has about 1/9 of that or so, maby 100W of energy available for conversion to heat.

You can boost a small solar panels output by about 3x, but be careful not to use a small focus or the cells will burn, etc.

[magx1]

A surface first concave mirror might work better. The mirror might reflect longer (infrared) wavelengths that are mostly absorbed by the lens. I make my concave mirrors out of old wide angle (truck) mirrors. The 'inside' of these are usually painted, but nail polish remover or paint remover will take the paint off. What results is a fairly decent concave (surface first) mirror. With a mirror like this, even a clear (not frosted) light bulb will produce a warm spot on my finger.

[higgrobot]

It's called a "fresnel lens" do a search for them, the bigger ones can melt glass, copper, concrete and thin steel. The 250mw comparison is way off, to start with there's ~21.5W of sunlight hitting the lens, that's magnified ~800 times down to a 1/2" spot where's the temps can hit 2500F, try that with a 250mw diode

[agent900]

I have a large "classic magnifying glass" which can burn pretty much anything instantly. Its works good for making fires as well.

[rata254]

That gives me an idea..(cackles insanely)

[AMMarkowski]

thats a pussy magnifying glass look at my video

[smurf88]

That's crazy, I want one except I'd probably be tempted to put my hand under it.

[kptmkr]

way over 250 mw

[Soccer769]

Cool.

[Nenz82]

its like a prism

[MaverickHunter75]

this is not the same strength as a 250 mw laser. this is alot stronger.

[insonomatory]

stupid

[Nomaki]

But with a laser you can burn things when there's no sun xP

[h3nkku]

a fresnel lens huh

[xXxmidgexXx]

*sizzle*

[sundaynitesorrow]

and what do you do on a rainy day? LOL

[dragerx001]

get a flash light!!! hahahahah

[bgineat]

cool!! where do you get that? that thing did smoke stufff fast

[physicmad]

i got it from my aunty who sadly died a couple of years ago, it was originlly helping her read books.