Answer:
The velocity of sound in \[C{{O}_{2}}\] is less than that in air. Hence a balloon filled with \[C{{O}_{2}}\] will behave like a convex lens. But the velocity of sound in \[{{H}_{2}}\] is greater than that in air, so a balloon filled with \[{{H}_{2}}\] will behave like a concave lens.
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