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Lumen - In physics, specifically photometry (optics), the lumen (symbol: lm) is the SI derived unit of luminous flux. It is the amount of light that falls on a unit spherical area at unit distance from a sour. Used . ce of one candela. In steradians this is equivalent to the amount of light that falls on a unit solid angle from a light source of one candela. Alternatively, one lumen is the total light pro. Used . duced by an isotropic light source of (1/4p) candelas. A 100 watt incandescent light bulb will output around 1500 lumens. ...

Polarity - The polarity of an object is, in general, its physical alignment. The term is often used to describe the positive and negative ends of batteries and magnets.

In cell biology, polarity ref. Used . ers to cells not being point-symmetrical in their spatial organization. This is particularly evident for cells organized in single cell layers that separate organs or subcompartments in organ. Used . isms.

In chemistry, molecular polarity refers to the dipole-dipole intermolecular forces between the slightly positive end of one molecule to the negative end of another or the same molecule. Mole...

Depth of Field - While a lens focuses on a single plane of depth, there is usually an additional area in focus behind and in front of that plane. This is depth of field. Depth of field increases as the iris is closed.. Used . There is more depth of field the wider the lens and le . Used . ...

Wavelength - The distance from one point, usually the crest, on a vibrating wave to the same point on the next wave. The shorter the wavelength the higher the frequency and the more directional the wave and vice . Used . versa. Commonly designated by the Greek letter lambda (?), wavelengths are usually measured in Angstroms.. Used . ...

Speaker - A speaker is a device that converts an electrical signal into the equivalent air vibrations in order to make audible sound.. Used . . Used . ...