Optical Instruments The Light Microscope

Try these questions

5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. When you place a new slide on a light microscope, which objective lens should you use first to locate and centre the specimen?

   • A. High power (40^x)
   • B. Medium power (10^x)
   • C. Low power (4^x)
   • D. Any lens, since they all give the same field of view

2. 2. A learner uses a microscope with a 10^x eyepiece lens and a 40^x objective lens. What is the total magnification of the image?

   Type your answer (in times (x)) in the lesson.

3. 3. What is the correct way to carry a light microscope across the laboratory?

   • A. Hold the stage with one hand and swing it by your side
   • B. Grip the arm with one hand, support the base with the other, and keep it upright
   • C. Hold it by the eyepiece lens and the objective lenses
   • D. Carry it by the body tube with one hand while tilted

4. 4. Name the part of the microscope, found beneath the stage aperture, that is adjusted to regulate the amount of light reaching the specimen.

   Type your answer in the lesson.

5. 5. Why must you never use the coarse adjustment knob when focusing under high power?

   • A. It automatically rotates the nosepiece back to low power
   • B. It moves the stage too quickly and risks smashing the slide against the long objective lens
   • C. It permanently blurs the eyepiece lens with grease
   • D. It turns the mirror away from the stage aperture

More in Laboratory Apparatus & Instruments

• ▸Measuring Mass and Weight in the Laboratory
• ▸Measuring Liquid Volume
• ▸Measuring the Volume of Irregular Solids and Calculating Density
• ▸Measuring Time and Rate in Experiments
• ▸Operating the Light Microscope
• ▸Electrical Instruments
• ▸Magnetic and Static Electricity Apparatus
• ▸Apparatus Maintenance, Storage, Improvisation, and Review

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