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  3. a bulb is placed at depth of 2 7 m in water and a

A bulb is placed at depth of 2 7 m in water and a floating...

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A bulb is placed at depth of 2 7 m in water and a floating opaque disc is placed over the bulb so that bulb does not appear visible from the surface The minimum radius of the disc is w 4 3 06m O 2 7m O 4 9 m 12 m

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