Question

5. Identify the location of the objectives. They are internally housed within the head of the microscope. Locate the zoom control knob that changes the objectives be to view the specimen. The numbers on this control usually represent the magnifications of the objectives housed within the ocular system. To obtain to- tal magnifications, multiply these numbers with the magnification of the oculars, which is usually 10x. The zoom control knob lists either total magnifications or magnifications of the objectives available. Check with your instructor to confirm total ing used magnifcations in the microscope model that you are using. Questions for Review ing microscope? Question 16: What are the total magnifications that can be obtained with your dissect Find the focusing knob located on the arm of the microscope. The focusing knob moves the lens s Notice the relatively large working distance between the lens system and the stage to allow for specimens of different sizes and also to allow for specimen manipula tion (dissection). 6. ystem up and down. The stage is stationary in this microscope. Observe the illumination system in your microscope. You have both transmitted light coming up through the stage and reflected light being projected down onto the stage. Note the control panel on the edge of the stage that allows you to turn each of these light sources on and off, as well as regulate their intensities. Turn on light source and practice manipulating the light projected on the stage. 7.

Answer 1

total magnification power = ocular lens magnifing power X objective lens magnifing power.

If., ocular lens magnifing power =10X

objective lens magnifing power. =4X

then , total magnification power = 40.X

In a dissection microscope max. 100X mmagnification possible.

Ocular lens Zoom control knob Objective lens Objective position Coarse Focusing knob Fine Focusing knob illuminator