HC Verma - Concepts of Physics Part 1

Book: HC Verma - Concepts of Physics Part 1

Chapter: 18. Geometrical Optics

Subject: Physics - Class 11th

Q. No. 14 of Short Answer

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An air bubble is formed inside water. Does it act as a converging lens or a diverging lens?

The lensmaker’s formula is

Now, refractive index of water is more than air. So, hence, f<0.

And, we know, focal length is negative for a concave lens only. So, it is diverging one.

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