Describe with the aid of a diagram the operation of an optical pyrometer 

Describe with the aid of a diagram the operation of an optical pyrometer

• the filament is focused on the eye piece and the objective lens focuses the object so that the image of the object lies in the same plane as the filament
• Light from the hot object and the filament is passed through the red filter and viewed by the eyepiece.
• Current is adjusted by the rheostat R until the filament and the object are equally bright.
• The temperature of the hot body is then read from the calibrated ammeter, A.

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