EYEPIECES : High quality paired eyepieces 10 x (standard), 15 x (optional) extra wide field, high eye reliet type.

Mangnification	Field Diameter	Eyepoint
10 x WF (Imported Glass)	18.0mm	25.0mm
15 x WF	13.0mm	12.0mm

Objective : Choice of partocal, parcentered, Semi Plan (SP), Achromatic objectives in magnification range, 4x, 10 x and retractable 40 x and 100x oil.

Objective Type	Magnification	N.A	Working Distance
Achromatic	4x	0.10	8.00mm
Semi Plan (SP)	10x	0.25	2.00mm
(Imported Glass)	40x Spring	0.65	0.14mm

Terms describing the optical features of microscope

Total Magnification  : Total magnification of a microscope is the individual magnifying power of the objective multiplied by that of the eyepieces.

Numerical Aperture  (N.A)  :  One of the important factors determining the efficiency of condenser and objectives. it is represented by the formula. ( N.A. = n sin a )

Where n is the retractive index of a medium and ‘a’ is half of the maximum angle at which the light rays enter or leave the lens from or to a focussecd object point on the optical axis.

Working Distance :  Clearance between the from of the objective and the upper surface of the cover glass when the image of a specimen is brought into sharp focus. Generally, the higher the magnifying power of the objective, the shorter the working distance.

Field Diameter : Diameter (MM) of the field of view which can be observed through the eyepiece. Indication 10x on the top of the eyepiece shows that eyepiece magnification is 10x.