which objective lens requires oil to be applied? multiple choice 40x 4x 100x 10x

which objective lens requires oil to be applied? multiple choice 40x 4x 100x 10x
Answer
Brief Explanations:
In microscopy, the 100x objective lens requires immersion oil to be applied. Oil immersion microscopy helps to increase the numerical aperture and resolution by reducing light refraction at the air - glass interface.
Answer:
C. 100x