What is intensity??
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Meghna Thapar 4 years, 1 month ago
Luminous intensity, the quantity of visible light that is emitted in unit time per unit solid angle. The unit for the quantity of light flowing from a source in any one second (the luminous power, or luminous flux) is called the lumen. The intensity is defined as power per unit area, and power is defined as energy per unit time. Thus: I=PA=EΔt1A. Because when intensity of incident light increases, it means that number of photons increases in incident light. If number of incident photons increases, then number of emitted photo electrons also increases, consequently the photo electric current increases.
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