Some firemen came into my aunt's small office and said her home depot's fire extinguishers were not enough? But need Fire Department certified company's fire extinguishers? Is that true? And How much does it cost to have a fire department approved fire extinguisher? I read online that we also need monthly inspection on those extinguishers? How much will it cost?Thanks for any help.
The generic physical term for what an optical fiber does is a waveguide. Fiber optic cables are a type of optical waveguide. A waveguide is a long cavity (which could actually be a solid object) that reflects electromagnetic energy back into itself. It is used for the function of guiding an EM wave from one point to another (hence waveguide). In particle accelerators, waveguides are used to channel microwave radiation from a powerful emitter down to the particle beam. These guides are frequently made of sheet metal. You may also find microwave waveguides inside your microwave oven. The microwave waveguides just described trap the EM wave through simple reflection (as in a mirror). There are also optical waveguides which use the same principle. These are tubes lined with a reflective material, and they are generally used in skylights. A fiber optic cable has a glass or plastic cavity surrounded by a plastic with a lower index of refraction, and then some sort of protective covering. Optical wavelength EM waves are trapped inside of it by total internal reflection (until they reach the end).
Laws of physicshmmm. physics-pertaining to things observable laws-governing bodies optical fibres- that which is less than seen which constitute things seen. They are the colors of the rainbow, easily said, hard proven. Fibre-optics are more easily explained. Without moisture, atmosphere they don't exist. why do we look for water on any planet,moon, celestial body?
I'm sure I could come up with more, but here are some. - Read the manual - If you think you got the shot with one shot, take another. - Even a cheap tripod is better than no tripod. - When you see everyone around you taking a picture from one spot, look around for a different one. - Don't trust your camera's metering. - Don't trust your digital camera's LCD. (I've had plenty of shots where they look fine on the LCD, but they're really crap. And vice versa. I use it only for histograms now.) - Read the manual - Never assume you have enough memory or that the batteries are charged enough. - You can make your own hot lights with compact-fluorescent, daylight-balanced bulbs. - Don't trust your camera's auto white balance; carry a white card with you. - Read the manual - You will not become rich because you bought a professional camera. - Don't listen to what people say about their camera or your camera; they love theirs as much as you love yours. You wouldn't believe them if they said their kid was better than yours, would you? - Sometimes cheap equipment works great for the need. - Sometimes the expensive equipment is junk, too. (I'm thinking of a certain tripod I had.) - If you like the shot, that's all that matters. - It's not the camera, it's the eyeball behind the camera and the finger that presses the shutter release. - It's not the megapixels. - Get a small-ish camera bag for everyday use. One body, 2 lenses. Or you'll be paralyzed by indecision. Or paralyzed by back strain. - Read the manual
