why can't we see anything in dark room
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When we see an object, we are actually seeing the light that is reflected off of it. Different materials reflect different frequencies of light in different ways and we interpret this as color. Things that don’t reflect light look black (they absorb rather than reflect light, that’s why your black pants will feel warmer than your white T-shirt on a sunny day). When it’s dark that means that there is no light (from the sun or bulbs) to be reflected so no objects reflect light, so everything looks black.
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Our eyes need light
When light enter our eyes a image is formed by brain
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