Q. 165.0( 1 Vote )
Two light sources of intensities 8 Cd and 12 Cd placed on the same side of a photometer screen at a distance of 40 cm from it. Where should an 80 Cd source be placed to balance the illuminance?
Answer :
Total intensity of the 8 Cd and the 12 Cd light source is (8+12) =20 Cd.
Let 
be the distance of the 80 Cd source.
∴ Illuminance due to the 20 Cd source 
is:
------------- (1)
∴ Illuminance due to the 80 Cd source 
is:
--------------- (2)
As
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