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The value of numerical aperature of the objective lens of a microscope is 1.25. If light of wavelength 5000 Å is used, the minimum separation between two points, to be seen as distinct, will be :

1. 0.12 μ m
2. 0.38 μ m
3. 0.24 μ m
4. 0.48 μ m

Correct answer: 0.24 μ m

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