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on which power should one first view a specimen

The lens with 4x magnification or the lowest power objective

Explanation:

When you use the low power objective, you have a wider field of view. This would make locating the specimen a lot easier than it would be if you used one with a higher magnification. Once you focus the microscope using the low power objective, you can switch to the higher magnification lenses.

but there is no

i guess you forgot putting it.