An air bubble inside a water tank would behave as a

Concave lens

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Convex lens

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May be both

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Neither concave, nor convex lens

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Solution

The correct option is A Concave lens

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Find the excess pressure inside (a) a drop of mercury of radius 2 mm (b) a soap bubble of radius 4 mm and (c) an air bubble of radius 4 mm formed inside a tank of water. Surface tension of mercury , soap solution and water are $0.46 N m^{- 1}, 0.03 N m^{- 1}$ and $0.076 N m^{- 1}$ respectively.

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