For a total magnification of 20X, a 5X eyepiece with a 4X objective should be used.
HOW TO CALCULATE MAGNIFICATION:
- The total magnification of a microscope can be obtained by multiplying the power of the eyepiece or ocular lens by the power of the objective lens. That is;
Total magnification = eyepiece × objective
- In this case, to get a magnification of 20X, one should use a eyepiece of power 5X and objective lens of power 4X i.e. 5 × 4 = 20.
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