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What type of lens is an air bubble insid...

What type of lens is an air bubble inside water ?

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It behaves as a concave lens because water is denser than air.
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Assertion : A star will appear to twink le if seen from free space (say moon) Reason : An air bubbles inside water behave like a convergent lens .

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PRADEEP-RAY OPTICS-Very Short Answer (b)
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  7. What type of lens is a tumbler filled with water ?

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  8. What type of lens is an air bubble inside water ?

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  9. a lens of glass is immersed in water. How is power of lens affected ?

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  14. Two thin lenses of power + 6 D and - 2 D are in contact. What is the f...

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  15. What is the basis of an optical fibre ?

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  18. Define one dioptre of power of a lens.

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