What is a plan objective?
Plan objective–These objectives produces a flat image across the field of view. A plan-achromat, plan-fluorite or plan-apochromat are corrected. Infinity Correction–When measuring from the back end of the objective to the primary focal plane, many microscopes are limited to a specific distance (160mm).
What are the 4 microscope objectives?
Your microscope has 4 objective lenses: Scanning (4x), Low (10x), High (40x), and Oil Immersion (100x).
What does plan mean on objective lens?
flat field
The term Plan stands for flat field. Lenses which are uncorrected for flatness of field will have the center of the field in focus and the outer edges out of focus (or vice versa depending on how you focus the lens). So Plan means the lens is corrected to allow the whole field to be in focus.
What is an example of a objective?
The definition of an objective is a goal or something to aim for. An example of objective is a list of things to accomplish during a meeting. Objective means someone or something that is without bias. An example of objective is a juror who doesn’t know anything about the case they’re assigned to.
What are types of objectives?
There are three basic types of objectives.
- Process objectives. These are the objectives that provide the groundwork or implementation necessary to achieve your other objectives.
- Behavioral objectives.
- Community-level outcome objectives.
What part of the microscope holds the objectives?
Revolving Nosepiece
Revolving Nosepiece or Turret: This is the part that holds two or more objective lenses and can be rotated to easily change power. Objective Lenses: Usually you will find 3 or 4 objective lenses on a microscope.
How do you read microscope objectives?
Microscope objective lenses will often have four numbers engraved on the barrel in a 2×2 array. The upper left number is the magnification factor of the objective. For example, 4x, 10x, 40x, and 100x. The upper right number is the numerical aperture of the objective.
What is a plan achromatic objective?
Achromatic Objective: A type of microscope objective that has a flat field in approximately 65% of the center of the image, compared to the 80% of a Semi-Plan objective and the 95% of a Plan objective.