When using a microscope, the coarse adjustment knob should only be used with which objective lens?

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  1. High-power objective lens
  2. Low-power objective lens
  3. Oil immersion objective lens
  4. Phase contrast objective lens

Answer (Detailed Solution Below)

Option 2 : Low-power objective lens
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SSC CHSL Exam 2023 Tier-I Official Paper (Held On: 02 Aug 2023 Shift 1)
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Detailed Solution

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The correct answer is: Low-power objective lens.

 Key Points

  • The coarse adjustment knob is used to quickly move the stage of the microscope up or down.
  • This quick and imprecise adjustment is ideal for the low-power objective lens, where the risk of collision between the lens and the slide is minimal.
  • It allows the observer to quickly bring the specimen into the general area of focus.
  • However, for higher magnification lenses, the fine adjustment knob should be used to avoid damaging the slide or the lens.

 Additional Information

  • A microscope is an instrument used to see objects that are too small for the naked eye.
  • Objective lenses are the primary lenses in a microscope that gather light from the sample, magnify the image of the sample, and project it into the eyepiece.
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