A light meter informs the camera operator how to set the camera to achieve the best image. Most digital cameras include light meters as built-in components. If a camera is set on automatic, the meter will kick in to measure the light in the frame before snapping the picture. Most built ...
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亮度计 lumiance light meter from vicimeter The illuminance meter, also called lux meter, is used to measure the brightness of ambient light, or the intensity of reflected light from illuminants. The ratio of the obtained luminous flux to the illuminated area is generally used to measure the ...
light is just a small part of a spectrum called Electromagnetic Radiation It is called visible light because that is the only part of the spectrum which our eyes have evolved to detect. The wavelengths of visible light range from 400-700 nm (micrometer – 10 -6 of a meter) Only objects...
Laser light is coherent light, or special "in-phase" light. What does "coherent" mean? As a kid I was always confused by explanations of coherent light. I'd been told that coherence had something to do with the sinusoidal shape of photons. Light is supposedly made up of little wiggling...
Viruses aren't alive; they can only grow and reproduce inside of the host cells they infect. Bacteria are living organisms. Both viruses and bacteria can get you very sick, but most bacteria are harmless and many are helpful.
Cells can vary between 1 micrometer (μm) and hundreds of micrometers in diameter. Within a cell, a DNA double helix is approximately 10 nanometers (nm) wide, whereas the cellular organelle called a nucleus that encloses this DNA can be approximately 1000 times bigger (about 10 μm). Se...