The Microscope! What do we know about the microscope? Ex: Parts and usage of the microscope.

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Presentation transcript:

The Microscope! What do we know about the microscope? Ex: Parts and usage of the microscope.

Stage Arm Ocular lens Base Fine adjustment knob Coarse adjustment knob Stage clips Diaphragm Light source Body Tube Revolving nose piece Objectives

Functions of the microscope! The stage will raise up and down, the light switch is on the side of the microscope and the light source is located on the base of the microscope. The diaphragm beneath the stage controls the amount of light that passes through the object being viewed. The difference between the coarse and fine adjustment knobs is, a fine adjustment knob permits exact focusing by moving objectives slightly and coarse adjustment knob moves the body tube for the objective to be in correct distance from the object being viewed. The ocular lens which is connected to the body tube is the lens one looks through to view the object. The arm connects to the base which stables the microscope. Slides are placed on the stage of the microscope and the stage clips hold the slides in place. The revolving nose piece turns the objective lenses to view the image at various powers.

Microscope rules Always carry or move a microscope with two hands, one on the arm, and one on the bottom. Always use the lowest power lens (the shortest lens) when you take a slide on and off the stage. Always start with the lowest power lens (the shortest lens). Get the slide in focus there, first using the coarse focus knob (the large knob) to get it close, THEN using the fine focus knob (the small knob) to get it perfectly in focus. From there, you can switch to a higher power lens. Always look from the SIDE of the microscope, not through the eyepiece, when switching lenses to avoid hitting the lens on the slide. Only use the coarse focus knob (the large knob) when you are using the lowest power lens (the shortest lens). Using the coarse focus knob on a higher power can crack the lens! Please turn off the light and cover the microscope when you are finished.

Microscope Lab! Predict what you will see in the microscope. - When viewing the letter “e” and the water drop at a 45˚ angle.

Why is the image upside down? Do we actually see upside down? Yes, when we view images with our own eyes, we are using a light source and our retina (the focal point) to focus on what we are viewing. Therefore, our retina flips the image upside down. Yet, when we are viewing through a compound microscope, the microscope is using a lens and a light source. Although, since the microscope does not have a retina, the picture is not flipped for us to see it right side up, therefore we see the image upside down.

Extra time! Look at objects in the room under the microscope! Ex: hair – split ends, finger nails...etc.