Everything about Objective Optics totally explained
An
objective in
optics is the
lens or
mirror in a
microscope,
telescope,
camera or other
optical instrument that receives the first
light rays from the object being observed. The objective is also called the
object lens,
object glass, and
objective glass.
Microscope objectives are typically designed to be
parfocal, which means that when one changes from one lens to another on a microscope, the sample stays in
focus. Microscope objectives are characterized by two parameters, namely,
magnification and
numerical aperture. The former typically ranges from 5× to 100× while the latter ranges from 0.14 to 0.7, corresponding to
focal lengths of about 40 to 2 mm, respectively. For high magnification applications, an
oil-immersion objective has to be used. The objective is specially designed and
refractive index matching oil must fill the air gap between the front element and the object to allow
numerical aperture to exceed 1, and hence give greater resolution at high magnification.
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