Asked Feb 8, 2019

The specimen that you are trying to find is very small and you cannot see it with scanning power. How can you reduce the search tome by finding the right place of focus?


Expert Answer

Step 1

Microscopy is a field which involves using a microscope to view those specimens in enlarged size which are not even visible with the naked eye. Most common laboratory microscopes have two lens for focussing a specimen bearing glass slide placed on the stage. 

These two are Objective lens and Eye peice.

Step 2

Eye peice is the one which is closer to the eye of the viewer. It is usually of 10x magnification i.e. it magnifies the specimen by 10 times.

Objective lens is that which is closer to the specimen. There are three types of objective lens present in the microscope with different magnifying powers.  

  • 4x : It is one with smallest magnifying power. It is termed as scanning objective as it is used to scan the object overall.
  • 10x: It is that with low power. 
  • 40x: It is the highest power objective and is used to get minute details of the cell.


Step 3

Scanning objective is used for focussing the object. The object is placed on stage and then focussed on lowest power. It is because at this, depth of focus is maximum. 

If the specimen is not focussed, then the focus has to be adjusted by ...

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