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The graph shows the current to light relationship. This light generated current flows in the opposite direction to current in a normal diode or led. Infrared Led Emitter And Detector Light Sensor Using Photo Transistor Electrical Engineering Color Click Tcs3471 Color Light Sensor With Rgb Led Diode A photodiode is often combined into a single component with an emitter of light usually a light emitting diode led either to detect the presence of a mechanical obstruction to the beam slotted optical switch or to couple two digital or analog circuits while maintaining extremely high electrical isolation between them often for safety optocoupler. Light sensor diode . A 230v ac supply is provided to the load in this case the load is represented with a lamp. Photodiodes and photo transistors are a few examples of photo detectors. Description extend your light sensin...