fresnel

Checking out some of the Fresnel videos on Youtube really helps one appreciate the power of the Sun.

These holograms are essentially a set of overlaid Fresnel lenses, and they work by the same principle?

Say you are just 1 mile from a friend, at 151Mhz the fresnel zone is 72ft tall.

You can make a thin lens by splitting it into many discontinuous parts, this is how a Fresnel lens works.

That's why you can build a Fresnel lens which is, so to speak, all surface.

This is really cool, although leaving that size of fresnel lens uncovered makes me nervous.

Just behind the LCD/film is a collimating lens (usually a Fresnel lens), which ensures that all the light produced by the lamp is focussed so that it passes through the first lens.

Possibly a Fresnel lens, if it can be made so that the ridges doesn't distort the screen image and cause weird patterns.

In an outdoor environment you also should keep 60% of the fresnel zone clear.

These processes naturally induce losses (non-radiative decay in the phosphor, Fresnel losses at one of the BEFs, no perfect reflection on the back mirror).

I built a rig with my son using a 65 inch Fresnel lens we harvested from an old rear projection TV.

Essentially it's energy-conserving materials with the correct fresnel effect based on the surface's IOR which takes things to the next level (for games at least).

Probably rather "Fresnel equations" and "interestingly shaped surfaces", along with "fluorescence".