Two lamps of illuminating powers 25 cd and 100 cd are placed at the end of a photometer bench 2.0 m long. At what point on the bench will the screen o

Two lamps of illuminating powers 25 cd and 100 cd are placed at the end of a photometer bench 2.0 m long. At what point on the bench will the screen o
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Two lamps of illuminating powers 25 cd and 100 cd are placed at the end of a photometer ... of the photometer be equally illuminated on both sides.
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