How to Make Fire with a MIRROR (and Mother-in-Law) – Quickfire 101 #10


Hello, I’m ROBwithaB
and today I’m going to show you how to make fire
with a mirror. ROBwithaB So I’ve been staying with the in-laws
for the last couple of weeks, so of course that erm,
made me think about burning stuff. M.I.L (downstairs): Rob?
What are you doing up there? ROB: Of course I can’t take the whole mirror
out into the sunshine so I’m just gonna use this. So it’s a very pleasant Autumn day,
or fall, here in Canada, maybe 15 to 16 degrees celsius
with the sun at a relatively low angle but the sky is very clear
and that’s gonna help us. Bonus points if you can tell me why
the sun makes that star shape in the video. So I’ve brought the mirror down from upstairs
here onto the deck and it’s certainly very shiny,
but that’s of course if we use this side of the mirror. With a flat mirror
the incoming parallel rays of the sun are all reflected at exactly the same angle
so there is no focusing even over long distances. On the other side is one of these,
a concave surface and I’m gonna have to be careful
not to aim that anywhere at the camera because I’m about to damage it. You can see what’s happening there… So that’s our friend the parabola again. Representations used in this video
are for dramatic purposes only. Any resemblance to any person,
living or dead, is entirely coincidental. There we go! And we have fire! Oonga Boonga Baby! If you liked this video feel free to
check out some of my others below, and there’s a subscribe button there
as well.

20 thoughts on “How to Make Fire with a MIRROR (and Mother-in-Law) – Quickfire 101 #10

  1. Holy Greek Concave Mirror Fire Weapons Batman!!! and star shape lens flares?? is this the technique for shooting flares and starbursts by using a narrow aperture such as f/22 and a relatively wide focal lengths like 18 mm? other than that, it's something Mitch does with his Canon 60D

  2. I just happen to have recently watched this video by MinutePhysics http://youtu.be/VVAKFJ8VVp4
    So I know that stars are "star shaped" but the video explains it better than I can.

  3. I think that the starburst effect has something to do with the amount of aperture blades in the camera through Fraunhofer diffraction. I think your camera had a small aperture with a low focal length with either 6 or 3 blades. 

  4. REDRUM!! REDRUM!!! REDRUM!!!

    (Sound of match striking, loud whoosh, running feet, maniacal cackle fading into distance)

  5. I have a question for you rob,
    Are you a trained scientist or just a really inventive pyromaniac?
    Can we call you Dr. Rob with a B? 😉

  6. Heeeei :)! Want to see how to make amazing simple projects? It's simple! Just check out my chanell!

  7. Okay cool…..Dr. Pyro…
    Hey! Sounds like a super hero…

    Faster than a speeding fire truck!
    Stronger than a cave man!
    Able to set fire to anything!
    It's DR. PYRO!!!!!!
    (With a B)

Leave a Reply

Your email address will not be published. Required fields are marked *