Answer :

Total intensity of the 8 Cd and the 12 Cd light source is (8+12) =20 Cd.

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)

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Two light sourcesHC Verma - Concepts of Physics Part 1