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