Question: Q. 8. A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65 . What is the nature of the lens?

A[Delhi 2015]

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Solution:

Ans. The lens behaves as a convex lense.

When the refractive index of a surrounding medium is more than refractive index of material of concave lens than the nature of the lens changes.

Commonly Made Error

  • Many candidates wrote the correct lens makers formula but could not relate that $\left(n_{21}-1\right)$ is still positive, so nature of lens will not change.

Answering Tips

  • Solve a few problems based on lens maker’s formula and learn what happens when the lens is immersed in (a) rarer medium (b) a denser medium.


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