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An air bubble in water will act like a

  • A.Convex lens
  • B.Convex mirror
  • C.Concave lens
  • D.Concave mirror

Answer: C

An air bubble in water behaves like a concave lens.

What matters is the refractive index of the lens relative to its surroundings. Air is optically rarer than water, so a bubble that is convex in shape diverges light instead of converging it, and acts as a diverging - concave - lens.

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