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A mercury thermometer is kept at the focus of a concave reflector behind its bulb as shown in the figure and in front of an electric furnace. Which of the following combinations will cause the largest reading of the thermometer?

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Black reflector and shiny bulb

Shiny reflector and black bulb

Black reflector and black bulb

Shiny reflector and shiny bulb

answer is D.

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Detailed Solution

Thermometer bulb has to absorb more heat, so it should have black bulb. Reflector has to reflect more heat waves towards thermometer bulb, so it should be shiny.

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