three lenses
Robert Hookes microscope had either two or more lenses. a simple microscope has one lens in it.
A compound microscope has2 convex lens.
The upper lens in a microscope is called the eyepiece or ocular lens. It is the lens through which the viewer looks to observe the magnified specimen on the microscope slide.
A simple microscope has only one lens.
The objective lens
The low power objective lens on a microscope is also known as the scanning lens.
a compound microscope has two or more lens while a simple microscope has only one lens
A monocular microscope typically has one main objective lens.
To change the magnification lens on a microscope, first, ensure that the microscope is turned off. Then, gently unscrew or detach the existing lens from the microscope. Carefully insert the new lens in its place and secure it in position. Finally, test the new lens by turning on the microscope and adjusting the focus as needed.
A microscope lens with a power of 40X will magnify an object 40 times its actual size.
optical microscope
The arrow would likely point to the cylinder lens, which is the objective lens of the microscope. This lens is responsible for magnifying the specimen being observed.