Question

You should always put oil on the slide before you try to get it into focus...

You should always put oil on the slide before you try to get it into focus at low magnification.

True
False
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Answer #1

Ans:

False

Explanation: Whem slide is observed in low magnification (100X; low power objective) oil does not put on the slide because the field of observation is bright and the object is well-clarified in low magnification. Oil is put on the slide when object is seen under high magnification (1000x; oil imersion objective) because the field of observation is poorly illuminated and the object is ill-clarified. The oil has higher refractive index and therefore receive more light through object and the image become well clarified.

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