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The filter itself sounds simple enough: a filter that blocks UV light. But, what does that mean, and why is blocking UV light something we want to do? Lenses ...

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I found a rear projection TV (see construction section below), took out the 2 foot by 4 foot fresnel lens and made this solar cooker. It cost me $0.00 since I used stuff I already had, either from previous projects or collected from junk (the lens, the wood came from discarded drawers.)

In my case the lens was attached to the TV box and not the frame so I took off everything that was attached to the frame and then attached the fresnel lens by itself to the frame. That's what you see in use in my solar cooker.

Calcium fluoride is an ionic crystal with the fluorine anions in a simple cubic array and calcium cations in half of the cubic sites of the structure.

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Warning... In some TVs the clear plastic screen, lens and a grating with vertical grooves are all attached to the frame and when you unscrew the frame from the TV it all comes away as one. Make sure to take all those pieces apart since you want to use the fresnel lens all by itself. If you don't then you will not get good results.

Jan 29, 2023 — If that particular amount of energy is just right for making one of these energy jumps, then that wavelength will be absorbed - its energy will ...

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Before making a permanent mounting system I first wanted to know the focal length so I quickly put together the temporary setup shown below. Notice that I went back and took the grey plastic frame that was also part of the TV rather than making my own wooden frame.

Nov 1, 2023 — To that end, we've pulled together 16 camera moves and camera shot types to give your storyboarding vocabulary a boost. Download camera angles ...

by CM Salazar Aquino · 2021 · Cited by 16 — Abstract In this paper, a novel technique is proposed to mitigate the so-called blind range on radars that use pulse compression.

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The first thing I cooked was minced pork. This one took a long time to cook because I started too late in the day (6:00pm, May 31, Ottawa, Ontario, Canada) but it proved it works!

I added a mirror to the fresnel lens so that I could send sunlight up to the bottom of a cooking pot instead of down to it. This allowed me to cook without having to wear welding goggles. Click here to see full details of this fresnel lens and mirror solar cooker and here to see how this fresnel lens and mirror solar cooker was designed.

Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 ...

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The bi-monthly online and print magazine published by the International Electrotechnical Commission, covering news on IEC standardization and conformity ...

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The meaning of PENTAPRISM is a pentagonal prism having one angle 90° and the others 112° 30', producing a constant deviation of 90° for any wavelength, ...

A fiber laser is a type of solid-state laser that uses an optical fiber as a gain medium. The core in the center of the fiber is doped with a rare-earth element ...

Unadapted borrowing from Latin aberrātiō(n) (relief, diversion), from aberr(ā) (wander away, go astray) (from ab (away) + errō (wander)) + -tiō(n) ( ...

Another warning... When I first took the lens home I held it in my hands and aimed it leafs and stuff. The stuff got hot but nothing burned. Rather than concluding it was useless, I decided to wait until I had it all mounted in a solid frame and I could find the focal length more precisely while the lens was more flat. I'm glad I did because as you now know, it works pretty well. So don't make the mistake that I almost did and that I know others have!