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Two small lamps A and B the first placed...

Two small lamps A and B the first placed at 0.6m to the left of a translucent screen and the second placed at 1m to the right of the screen produced equal illumination on both sides of the screen. A third lamp of the same luminous intensity as that of A is kept to the left of A at a distance of 0.4m from A. By what distance the source B should be moved to produce equal illumination again ?

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