Medium
$A$ microscope is focused on an object at the bottom of a bucket. If liquid with refractive index $\mu = \frac{5}{3}$ is poured inside the bucket,then the microscope has to be raised by $30\,cm$ to focus the object again. The height of the liquid in the bucket is $..........\,cm$.
- A$75$
- B$50$
- C$18$
- D$12$
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MediumAIIMS 2016
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Medium
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