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1.A small bul...

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1.A small bulb is placed at a depth of 2/\sqrt{7 }m in water and floating opaque disc is placed over the bulb so that the bulb is not visible from the surface.The minimum diameter of the disc is (water 4/3) (1) 42 m(3) 2/7 m(2) 6 m(4) 12 m

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