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the optical system of a microscope is the objectives
An optical microscope uses light and one or more lenses to view cells. An optical microscope with two or more lenses is called a compound optical microscope.
A CD-ROM ( Compact Disc- Read Only Memory ) is an Optical Type of Device. The reason of it being optical lies in the fact that its read/write head is optical in nature ( It uses a red colored light).
AIDS is a disease caused by the HIV virus. This is different than a bacteria.
The cornea (aka lens).