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Wave Optics
Two semiconductor materials X and Y shown in the given figure, are made by doping germanium crystal with indium and arsenic respectively. The two are joined end to end and connected to a battery as shown.
(i) Will the junction be forward biased or reverse biased?
(ii) Sketch a V - I graph for this arrangement. 
(i) X is a p-type semiconductor and Y is an n-type semiconductor. So the junction is reverse biased.
(ii) The V-I graph for a reverse biased junction is given below: 
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