Видео с ютуба Giant Lens Experiment

Линза Френеля, плавящаяся в ГРАНИТЕ при температуре 2300° по Фаренгейту, делает обсидиан ЛИНЗОЙ Ф...

We made a GIANT MAGNIFYING GLASS that exceeds 1110°F

Burning stuff with a giant fresnel lens + how a DLP projector works

2,000°F Solar Power! Melting Metal With A Giant Magnifying Glass

Melt a Penny with the Sun and a Fresnel Lens - (magnifying glass)

What Happens if You Focus a 5W Laser With a Giant Magnifying Glass? Negative Kelvin Temperature!

Burning Stuff With 2000ºF Solar Power!!