== ==
Common causes of tangential distortion in photography include using wide-angle lenses, shooting at extreme angles, and improper lens alignment. To correct tangential distortion, photographers can use software correction tools, adjust the lens distortion settings in post-processing software, or use specialized lenses designed to minimize distortion.
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
a compound microscope has two or more lens while a simple microscope has only one lens
The low power objective lens on a microscope is also known as the scanning 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.
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.
A magnifying lens
high lens
scanner