Name Date Lab Section 13. f 20 objects fit across the diameter of a low power fi
ID: 143343 • Letter: N
Question
Name Date Lab Section 13. f 20 objects fit across the diameter of a low power field of view whose field diameter is 2.5mm, what would be the approximate size of each object? Round your answer to the nearest hundredth mm;um 14. Why should you always focus an object on a lower power before focusing on high? 15. When you focus with the coarse adjustment knob on your microscope, do you raise and lower the arm (body tube), or do you raise and lower the stage? 16. When a microscope is in focus with one objective, when the objective is rotated, the image will remain in focus. The term that describes this is 17. State why you should not use the coarse adjustment knob for focusing when the high- power objective or oil-immersion objective in its normal operating position. 18. What happens to the size of the field of vision in a compound microscope when the total magnification is increased?Explanation / Answer
13. 2.5mm/20 = 0.125mm
= 125um
14. At lower power we can able to focus larger diameter. So we can able to identified where the object present in slide. Then we focus particular part of the objects present in the slide by higher power.
15. Raise and lower the stage
16. Lens quality good
17. The specimen already very near to lens, so if we use coarse adjustment knob the speimen hit the slide. The coarse knob used only when first focusing the object. For high power or oil immersion only use fine adjustment.
18. Blurred
The light intensity decreases as magnification increases.
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