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Because the length of the objectives depends on the total magnification. Example:

Magnification: 50x (LPO)

You can see that the lower the magnification,the length of objective is the smallest.

Magnification: 500x (HPO)

You can see that the higher the magnification, the length of objective is bigger than the other objectives.

If the objective is lower, the number is lesser

-Guinean026

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