B.Sc IInd year IIIrd Sem. Apparatus : A 6 volt, 6 watt bulb (the filement of bulb being considered as the blck body), power supply or battery, a rheostat (100Ω, 3 A), an ammeter (range 3 A), a voltmeter (range 10 V), a green colour filter, a convex lens, a photovoltaic cell, a micro-ammeter, a wooden or card board hollow box and connection wires.
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