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The maximum possible numerical aperture of 1.5 is for a ______________ lens.

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The maximum possible numerical aperture of 1.5 is for a ______________ lens.

(a) oil immersion

(b) air interface

(c) water interface

(d) binocular

The question was asked in exam.

Enquiry is from Techniques in section Techniques in Cell Biology of Cell Biology

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Right answer is (a) oil immersion

Easy explanation: For a lens to be used in oil immersion, the maximum possible numerical aperture is 1.5. The maximum useful magnification of a microscope is 500 to 1000 times that of the numerical aperture of the objective lens being used.

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