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A double convex air bubble in water behaves as
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divergent lens
$\mu_{\text {water }}=1.33 \text { and } \mu_{\text {air }}=1$
As air is optically rarer, $\mu_{\text {air }} < \mu_{\text {glass, }}$, converging nature of the convex lens changes to diverging.
Thus it behaves as divergent lens.
As air is optically rarer, $\mu_{\text {air }} < \mu_{\text {glass, }}$, converging nature of the convex lens changes to diverging.
Thus it behaves as divergent lens.
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