The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by

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Painting the surface white (with aluminium paint)

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Painting the surface black

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Giving the surface a mirror finish

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Roughening the surface

Q. The heat transfer by radiation from a mild steel surface is to be reduced by reducing the emissivity of the surface. This can be best achieved by