21. | Which part of the compound microscope helps in gathering and focusing light rays on the specimen to be viewed? |
a. | Eyepiece lens |
b. | Objective lens |
c. | Condenser lens |
d. | Magnifying lens |
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Answer: (c).Condenser lens
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22. | What is the minimum distance for the eye to focus any object? |
a. | 11 cm |
b. | 25 cm |
c. | 32 cm |
d. | 4 2 cm |
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Answer: (b).25 cm
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23. | Resolving power of a microscope is a function of____________ |
a. | Wavelength of light used |
b. | Numerical aperture of lens system |
c. | Refractive index |
d. | Wavelength of light used and numerical aperture of lens system |
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Answer: (d).Wavelength of light used and numerical aperture of lens system
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24. | The greatest resolution in light microscopy can be obtained with ___________ |
a. | Longest wavelength of visible light used |
b. | An objective with minimum numerical aperture |
c. | Shortest wavelength of visible light used |
d. | Shortest wavelength of visible light used and an objective with the maximum numerical aperture |
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Answer: (d).Shortest wavelength of visible light used and an objective with the maximum numerical aperture
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25. | Oil immersion objective lens has an NA value of____________ |
a. | 0.65 |
b. | 0.85 |
c. | 1.33 |
d. | 1.00 |
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Answer: (c).1.33
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