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  4. A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index (5/3) is poured inside the bucket, then microscope have to be raised by 30 cm to focus the object again. The height of the liquid in the bucket is :

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Q. A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index $\frac{5}{3}$ is poured inside the bucket, then microscope have to be raised by $30\, cm$ to focus the object again. The height of the liquid in the bucket is :

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Solution:

Correct answer is (d) 75 cm