Explain the construction and working of varactor diode. Write its two applications.

A varactor diode, also known as a varicap or tuning diode, is a type of semiconductor diode that functions as a variable capacitor when reverse-biased. It is constructed using a p-n junction, where the reverse-biased junction forms a depletion region that behaves like a capacitor. The size of the depletion region _______ ________ ___ ______ __________ __________ __________ ______ _______ _____ ________ ____.
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