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What kind of lens is an air bubble in wa...

What kind of lens is an air bubble in water?

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Concave lens. This is because both the convex surfaces face towards denser (water) medium and air inside the bubble is rarer.
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  • A convex lens made of glass has focal length 0.15 m in air. If the refractive index of glass is 3/2 and that of water is 4/3, the focal length of lens when immersed in water is

    A
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    B
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    C
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    D
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