16. What happens to field of-view when you switch from low power to high power?

Question

16. What happens to field of-view when you switch from low power to high power? A It decreases. B. It increases. C. It remains the same (no change 17. What is the function of the iris diaphragm? It changes the amount of light passing to the specimen It mechanically moves the slide around on the stage. C. It focuses the specimen. D. It rotates so that different lenses can be selected. is observing a specimen using the compound light microscope. He specimen centered in the field of view and focused on low power. He next power objective lens and finds that the specimen is no 18. A student has his switches to the longer in perfect focus. What should he do next? A. Adjust the focus using only the fine focus knob. B. Adjust the focus using only the coarse focus knob. C. Adjust the focus by first using the coarse adjustment knob followed by use of the fine focus knob. D. Nothing, specimens are never in clear focus on the higher magnifications. 19. Before returning your microscope to the cabinet, you should A. B. C. D. make sure you have removed your slide from the stage. place the low power objective in the down position. wrap the electrical cord around the microscope. all of the above. 20. The field of view for a particular microscope is 4mm. An object you are viewing extends 1/3 across the diameter of the field of view. What is the approximate size of the specimen? A. 12 mm B. 12 m C.1200 ?m D, 1.3 mm E, 130 ?m

Explanation / Answer

16)A- decrease

17) A-it changes the amount of light passing by to the specimen.

18)B

19)D

20)B

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