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How to Read a Histology Slide Quiz
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What does resolution mean when examining a histology slide?
- A The staining intensity produced by haematoxylin and eosin You picked ✕
- B The degree of contrast between differently stained cellular components You picked ✕
- C The ability of a lens to gather light from the specimen You picked ✕
- D The smallest distance at which two neighbouring points can still be seen as separate You picked ✓
- E The depth of the specimen that remains in focus at one time You picked ✕
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The answer is D: The smallest distance at which two neighbouring points can still be seen as separate
Explanation
Why D is correct
See Magnification and Resolution. Option D is correct because resolution is the ability to tell that two neighbouring points are separate rather than blurred into one. A high-resolution image looks sharp and a low-resolution image looks fuzzy. Resolution is set by the optics: shorter wavelengths of light can resolve smaller structures, and a lens with a higher numerical aperture (a measure of how much light the lens can gather) resolves better. This is different from magnification, which only states how many times larger the image appears than the real object, for example 400 times. Making an image larger does not guarantee that more detail can be seen. If the optics cannot separate two points, enlarging the image simply gives a bigger blur, which is called empty magnification. On a histology slide this matters when you ask whether two nuclear edges, two cell borders or two fine fibres really are separate structures. The usual habit is to survey the whole section at low power, choose a region worth examining, and only then step up the power, checking that genuinely new detail appears at each step.
- Resolution: Resolution is the ability to tell two neighbouring points apart, so a high-resolution image looks sharp.
- What sets it: Shorter wavelengths and a higher numerical aperture improve resolution.
- Magnification: Magnification only states how many times larger the image appears.
- Empty magnification: Enlarging an image that the optics cannot resolve just gives a bigger blur.
Why the other options are incorrect
- A. The staining intensity produced by haematoxylin and eosin: Staining intensity depends on the dyes, the tissue chemistry and how the slide was processed. It is not a measure of how well the microscope separates close points. Your answer
- B. The degree of contrast between differently stained cellular components: Contrast is the difference in brightness or colour between structures, and stains increase it so that structures are easier to see. It is a separate property from resolution, although a well-contrasted image is easier to judge. Your answer
- C. The ability of a lens to gather light from the specimen: This describes numerical aperture, which is a measure of the objective's light-gathering ability; it influences resolution but is not the same as the smallest distance that can be resolved. Your answer
- E. The depth of the specimen that remains in focus at one time: This describes depth of field, which is the axial thickness in acceptable focus. A larger depth of field keeps more of the section in focus, but it is a separate property from resolution. Your answer
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More questions from this set. Start the quiz to answer them and see each explanation.
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1
A smooth, dark band is seen running across an otherwise orderly stained section, with no granularity and no normal structure at that site. What is the most likely explanation?
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2
A heart-wall sample shows striated, pink-staining (eosinophilic) fibres that branch, with nuclei that are usually central and transverse junctions between cells. Which tissue fits best?
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