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Description : Draw the symbol of LED & photodiode. 

Answer : Symbol of LED & photodiode

Description : What is photodiode? Draw the symbol and explain operation of photodiode. 

Answer : A photodiode is a light detector that converts light into an electrical current. A photodiode is a semi-conductor device, with a p-n junction and an intrinsic layer between p and n layers ... current is independent of reverse bias voltage. Reverse current is mostly depends on the light intensity.

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