These are the lens used for magnifying the specimen on the stage. Four or five are normally supplied (x4, x10, x25, x50).
This allows a real and inverted image to be obtained of the object under examination.
It lets the polarised light pass through without affecting the polarisation plane.
Objectives are often mounted on a revolving objective holder (1), which allows quick and easy change of magnification.
When the stage is rotated, the axis of rotation should coincide with the centre of the field of view (the axis of the microscope). This is achieved on some microscopes by adjusting a collar on the barrel of each objective (2)
To centre a microscope, the point about which an object is seen to rotate when the stage is rotated must be brought to the centre of the cross-hairs by adjusting the centring screws.
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