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An eye can distinguish between two points

Question:

An eye can distinguish between two points of an object if they are separated by more than $0.22 \mathrm{~mm}$ when the object is placed at $25 \mathrm{~cm}$ from the eye. The object is now seen by a compound microscope having a 20 D objectives and 10 D eyepiece separated by a distance of $20 \mathrm{~cm}$. The final image is formed at $25 \mathrm{~cm}$ from the eye. What is the minimum separation between two points of the object which can now be distinguished?

Solution:

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