Methods in Microbiology [GATE (Graduate Aptitude Test in Engineering) Microbiology]: Questions 17 - 18 of 18

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Question 17

Methods in Microbiology
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Appeared in Year: 2015

Question

Numeric Answer▾

An oil immersion objective of a light microscope has a numerical aperture of 1.25. Using the Abbé equation, the maximum theoretical resolving power (in nm) of the microscope with this objective and blue light (wavelength = 450 nm) is ________

Question 18

Methods in Microbiology

Appeared in Year: 2018

Question

MCQ▾

Which of the following combinations would improve the resolution of a microscope?

(i) Increasing the half aperture angle of the objective lens

(ii) Decreasing the wavelength of the illumination source

(iii) Decreasing the numerical aperture of the objective lens

(iv) Decreasing the refractive index of immersion medium

Choose the Correct Option:

Choices

Choice (4)Response

a.

(ii) and (iv)

b.

(ii) and (iii)

c.

(i) and (ii)

d.

(i) and (iii)

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