Refraction and interference within a specimen give high contrast without any stain at all in the:
AElectron microscope
BPhase-contrast microscope
CDarkfield microscope
DBrightfield microscope
Answer & Solution
Correct answer: B. Phase-contrast microscope
1. No dye touches the sample.
2. Interference does the work.
3. It is the phase-contrast microscope.
_Source: OpenStax Microbiology, Chapter 2, How We See the Invisible World._
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