1 Look through the eyepiece (1) and move the focus knob until the image comes into focus. 2  Adjust the condenser (7) and light intensity for the greatest amount of light.  Move the microscope slide around until the sample is in the centre of the field of view (what you see).
http://www2.mrc-lmb.cam.ac.uk/microscopes4schools/microscopes2.php
CHECK OUR PHOTOS. That gizmo pictured to the left is a BIG deal. It literally opened up worlds of organisms and information to scientists. It's importance in the history of medicine and our understanding of disease should not be underestimated. That gizmo is a compound light microscope. For you, the biology student, it is perhaps the most important tool for you to understand. By the time you are done toying with these pages (& reading your text & paying attention in class), you should be able to :
https://hobart.k12.in.us/jkousen/Biology/mscope.htm
The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high-powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes to a focus inside the microscope tube. The objective itself is usually a cylinder containing one or more lenses that are typically made of glass; its function is to collect light from the sample.
https://en.wikipedia.org/wiki/Objective_(optics)
1 Use only special lens paper to clean the lenses. 2  Always keep your microscope covered when not in use. 3  Always carry a microscope with both hands. Grasp the arm with one hand and place the other hand under the base for support.  Place your sample on the stage (3) and turn on the LED light (2).
http://www2.mrc-lmb.cam.ac.uk/microscopes4schools/microscopes2.php
Compound Microscopes. 1  Turn the revolving turret (2) so that the lowest power objective lens (eg. 4x) is clicked into position. 2  Place the microscope slide on the stage (6) and fasten it with the stage clips.  Look at the objective lens (3) and the stage from the side and turn the focus knob (4) so the stage moves upward.
http://www2.mrc-lmb.cam.ac.uk/microscopes4schools/microscopes2.php
How to Use a Microscope. 1  Turn the revolving turret (2) so that the lowest power objective lens (eg. 4x) is clicked into position. 2  Place the microscope slide on the stage (6) and fasten it with the stage clips.  Look at the objective lens (3) and the stage from the side and turn the focus knob (4) so the stage moves upward.
http://www2.mrc-lmb.cam.ac.uk/microscopes4schools/microscopes2.php
Several objective lenses on a microscope. In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image. Objectives can be a single lens or mirror, or combinations of several optical elements.
https://en.wikipedia.org/wiki/Objective_(optics)
Eyepiece Lens: the lens at the top that you look through. They are usually 10X or 15X power. Illuminator: A steady light source (110 volts) used in place of a mirror. If your microscope has a mirror, it is used to reflect light from an external light source up through the bottom of the stage. Stage: The flat platform where you place your slides. Stage clips hold the slides in place.
http://www.microscope-microscope.org/basic/microscope-parts.htm
Tube: Connects the eyepiece to the objective lenses. Arm: Supports the tube and connects it to the base. Base: The bottom of the microscope, used for support. Illuminator: A steady light source (110 volts) used in place of a mirror. If your microscope has a mirror, it is used to reflect light from an external light source up through the bottom of the stage. Stage: The flat platform where you place your slides.
http://www.microscope-microscope.org/basic/microscope-parts.htm
1 Turn the revolving turret (2) so that the lowest power objective lens (eg. 4x) is clicked into position. 2  Place the microscope slide on the stage (6) and fasten it with the stage clips.  Look at the objective lens (3) and the stage from the side and turn the focus knob (4) so the stage moves upward.
http://www2.mrc-lmb.cam.ac.uk/microscopes4schools/microscopes2.php
which object is used to focus light in a light microscope?
The objective lens is used to focus light in a light microscope.