Answered: Two light sources of intensities 8 Cd…

Two light sources of intensities 8 Cd and 12 Cd are placed on the same side of a photometer screen at a distance of 40 cm from it. Where should a 80 Cd source be placed to balance the illuminance ?

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter9: Optics

Section: Chapter Questions

Problem 32Q

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Question

Two light sources of intensities 8 Cd and 12 Cd
are placed on the same side of a photometer screen
at a distance of 40 cm from it. Where should a 80
Cd source be placed to balance the illuminance ?

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