As light travels in a straight line, when light shines on an opaque object, a shadow is formed behind the object. Shadows differ in different places and at different times. For example, the shadow of the same person in the sun is long, noon short
Through observation, we can find that the shadow of the object in the electric light is particularly dark in the middle, slightly shallow around. The special dark part of the middle of the shadow we call it the Umbra, the gray part of it, we call it the penumbra. The generation of these phenomena is closely related to the principle of linear propagation of light. The mystery is known by the following experiment.
We put an opaque cup on the horizontal table, lit a candle next to the glass will cast a clear shadow behind. If you light two candles beside the Cup, will form two overlapping and not overlap of the shadow, two of the shadow of the overlapping part of the total no light to shoot, and thus is All Black, this is the umbra; there is only one candle that can be reached by the umbra, which is half a half dark penumbra. If you ignite three or even four or more candles, the umbra will gradually shrink, and there will be many levels in the penumbra, and gradually become dimmer.
Objects in the electric light can produce the shadow of the Umbra and penumbra, also this truth. The lamp is illuminated by a curved filament, and the glow point is not limited to a single point. The light from some bursts is obscured by the object, and the light from the other bursts is not necessarily blocked. Obviously, the larger the area of the luminous body, the smaller the umbra. If we spot a candle around the cup, the umbra disappears and the penumbra is too faint to see.
As a result, the ceiling lamp in the surgical room is arranged in a circular form on a light plate by a large number of light emitting intensities, synthesizing a large area of light. In this way, the light can be irradiated to the operating table from different angles, not only to ensure the brightness of the operation vision, but also to affect the operation without obvious umbra. So the name is "lights."
Company Name:Vega Medical Equipment(Shanghai)
Contact: Laura duan
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