With the id of diagram explain how a bolometer is used to detect thermal radiation.

With the id of diagram explain how a bolometer is used to detect thermal radiation.

The bolometer strip is connected to Wheatstone bridge circuit above. The rheostat is adjusted until the galvanometer shows no deflection. When the radiations fall on the strip, they are absorbed and its temperature rises leading to an increase in resistance. The galvanometer deflects showing the presence of radiations.

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