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Home PYQs An air bubble in water will act like a convex mirror convex lens concave mirror concave lens Explanation Option (d) is correct An air bubble in water has a lower refractive index than the surrounding medium. It diverges light rays and behaves like a concave lens. Answer: (d) Concave lens 1995, PYQs ←The difference between a nuclear reactor and an atomic bomb is that [1995] Cryogenic engines find applications in ? sub-marine propulsion? frost-free refrigerators? [1995]→ ←The difference between a nuclear reactor and an atomic bomb is that [1995] Cryogenic engines find applications in ? sub-marine propulsion? frost-free refrigerators? [1995]→