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Thermodynamics

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Transmission Coefficient

A source S is placed on one side of a screen at a distance R from it and another source S₁is placed at a distance R₁ from the screen on the other side so that the photometric balance is obtained.

Now interpose the transmitting plate P, between the point A and the screen. Place the source S₁ at a suitable distance from the screen so that the photometric balance is obtained.

Suppose, in this case, the distance of the source S₁ from the screen is R₂. If the luminous flux on the screen is now due to the effective illuminating power L’, then L’ = tL₁ were t is the transmission efficient.

From equations (i) and (ii)