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In Newton's cooling experiment to reduce loss of heat the calorimeter should have .

$(a)\;\text{The outer surface blackened and unpolished } \\(b)\;\text{the outer surface bright and shining} \\(c)\;\text{Inner surface dark and unpolished} \\(d)\;\text{non conductivity}$

The calorimeter should have black and unpolished dull outer surface to reduce heat loss.
Hence a is the correct answer.