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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Yogita Basnal Best Answer
It happens because oil has greater refractive index than air. Refractive index is represented by "n". Numerical aperture is "n sin @" not "sin@". For numerical aperture we need to multiply n with sin@ so an increased value of "n" will increase resolution. Image is attached.