In a thermos flask, heat loss by radiation is minimizes by the

In a thermos flask, heat loss by radiation is minimizes by the

Answer Details

In a thermos flask, heat can be transferred by conduction, convection, and radiation. To minimize heat loss by radiation, the inner surface of the outer wall of the flask is usually silvered. This silvered surface is highly reflective and has low emissivity, meaning that it reflects radiation back into the flask and reduces the amount of heat lost to the surroundings. This is the reason why the silvered surface of a thermos flask appears mirror-like. Therefore, the correct answer is "silvered surfaces."