Oil immersion objective requires immersion oil because:

Practice question

Question

Oil immersion objective requires immersion oil because:

Options

Choose one · Correct answer highlighted

It cleans lens Oil has refractive index ~1.51 similar to glass, increasing NA to ~1.25-1.4 and preventing light loss by refraction Correct It magnifies more It cools lens

Explanation

Without oil, light refracts from glass to air (n=1.0) and is lost by total internal reflection. Oil bridges gap, allowing higher NA and resolution.

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