There is no other name for the objective lens. However, the eyepiece is also called the ocular lens.
The low power objective lens on a microscope is also known as the scanning lens.
Another name is eyepiece or eyepiece lens.
the name
The ocular is the upper lens and objective is the lower lens
low power objective lens
Because during movement of lens there is no slide below objective .
scanning objective
The 40x objective lens is one of the (usually) 3 objective lenses. It magnifies the image by 40x (hence the name). However, the image you view doesn't have a magnification of 40. There is the ocular lens, which typically is 5x or 10x, in addition to the objective lens.
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objective lens
The objective lens
The focal length of EyePiece is relatively larger to that of the Objective lens. Power of a lens is inversely proportional to it's focal length. Therefore, Objective is slightly more powerful than EyePiece.