Question

whichcells respondonly to intensityoflight with degreeof brightnessanddarkness​

Answer 1

Explanation:

Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light.[1] In other words, brightness is the perception elicited by the luminance of a visual target. It is not necessarily proportional to luminance. This is a subjective attribute/property of an object being observed and one of the color appearance parameters of color appearance models. Brightness refers to an absolute term and should not be confused with Lightness.[2]

The adjective bright derives from an Old English beorht with the same meaning via metathesis giving Middle English briht. The word is from a Common Germanic *berhtaz, ultimately from a PIE root with a closely related meaning, *bhereg- "white, bright". "Brightness" was formerly used as a synonym for the photometric term luminance and (incorrectly) for the radiometric term radiance. As defined by the US Federal Glossary of Telecommunication Terms (FS-1037C), "brightness" should now be used only for non-quantitative references to physiological sensations and perceptions of light.[3]

A given target luminance can elicit different perceptions of brightness in different contexts; see, for example, White's illusion.

In an RGB color space, brightness can be thought of as the arithmetic mean μ of the red, green, and blue color coordinates (although some of the three components make the light seem brighter than others, which, again, may be compensated by some display systems automatically[clarification needed]):[4]

{\displaystyle \mu ={R+G+B \over 3}}\mu ={R+G+B \over 3}

Brightness is also a color coordinate in HSL color space : hue, saturation, and lightness, meaning here brightness.

With regard to stars, brightness is quantified as apparent magnitude and absolute magnitude.

Brightness is, at least in some respects, the antonym of darkness.

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