Download the optical (light) microscope

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The eyepiece (ocular),
 It magnifies the primary image produced by the objective; the eye
can then use the full resolution capability of the objective.
 The microscope produces a virtual image of the specimen at the
point of most distinct vision, generally 250 mm (10 in.) from the eye.
The eyepiece magnifies this image, permitting achievement of
useful magnifications.
 The standard eyepiece has a 24-mm-diam field of view; wide-field
eyepieces for plano objectives have a 30-mm-diam field of view (Fig.
7), which increases the usable area of the primary image.
 The simplest eyepiece is the Huygenian, which is satisfactory for use
with low- and medium-power achromat objectives.
 Compensating eyepieces are used with high NA achromat and the
more highly corrected objectives. Because some lens corrections are
performed using these eyepieces, the eyepiece must be matched
with the type of objective used.