if black colour absorbs all light means no light is reflected from it then how we can see black colour
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《ANSWER》
=>Objects are visually perceived when they reflect light. A black object does not reflect any light. In other words, no photons are reflected to be detected by the photoreceptors in the retina. A black shape on a colored background appears black because its brightness approaches zero relative to its surroundings.
Black, as any other perceived hue, is a relative perception. The visual system, as any other sensory system, detects physical stimuli in a relative way. For example, under bright daylight (photopic conditions) a camera flash might appear as a weak source of light. That same flash viewed under dark (scoptopic) conditions may appear as a blinding flash. When the visual system is light-adapted, it needs a lot of photons to be able to respond to a visual stimulus. Under this condition, dark colored objects may appear black, simply because the photoreceptor's thresholds are too high. Conversely, that same dark object may appear as gray under scotopic conditions when the retina is dark-adapted (colors are not perceived under scotopic conditions - note here that black and white are not colors, but the two extremes on the perceived gray-scale).
《Hope Helped》
=>Objects are visually perceived when they reflect light. A black object does not reflect any light. In other words, no photons are reflected to be detected by the photoreceptors in the retina. A black shape on a colored background appears black because its brightness approaches zero relative to its surroundings.
Black, as any other perceived hue, is a relative perception. The visual system, as any other sensory system, detects physical stimuli in a relative way. For example, under bright daylight (photopic conditions) a camera flash might appear as a weak source of light. That same flash viewed under dark (scoptopic) conditions may appear as a blinding flash. When the visual system is light-adapted, it needs a lot of photons to be able to respond to a visual stimulus. Under this condition, dark colored objects may appear black, simply because the photoreceptor's thresholds are too high. Conversely, that same dark object may appear as gray under scotopic conditions when the retina is dark-adapted (colors are not perceived under scotopic conditions - note here that black and white are not colors, but the two extremes on the perceived gray-scale).
《Hope Helped》
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