GATE XE concept:optical-microscope PYQs & Answers

Questions 1–4 of 4. Imported answers require independent review unless marked reviewed.

For a conventional optical microscope, which of the following options regarding the resolution limit and the depth of field is/are correct?

Your answerSelect all correct options. You can choose more than one.

Resolution limit decreases with decreasing wavelength of light

Resolution limit decreases with decreasing refractive index of the medium

Depth of field decreases with increasing value of numerical aperture of the objective lens

Resolution limit decreases with increasing value of numerical aperture of the objective lens

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Which of the following statement(s) is/are true for an optical microscope?

Your answerSelect all correct options. You can choose more than one.

Increasing the aperture of the objective lens deteriorates the resolution

Reducing the wavelength of illuminating light improves the resolution

Increasing the refractive index of the medium in between the sample and the objective lens improves the resolution

Reducing the wavelength of illuminating light decreases the depth of field

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Smallest or minimum feature size that can be theoretically resolved in an optical microscope does NOT depend on:

Your answerChoose one option.

Refractive index of the medium between the lens and the focal point

Intensity of radiation

Wavelength of radiation

Numerical aperture of the objective lens

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On decreasing the objective aperture size in an optical microscope

Your answerChoose one option.

the spherical aberration increases

the depth of field increases

the diffraction-limited resolution increases

the astigmatism increases

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GATE XE concept:optical-microscope PYQs