The power of a lense in air is -5D then find the power of the lense in a medium of 1.6 refractive index.

This is a numerical type question about how to find the power of a lense in different medium. Actually this is not that difficult, you just have to apply the lense maker law and you can derive the right answer.
Here, this is also stated that the power of a lense is not always the reciprocal of focal length.
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