Question: OBSERVING THE LETTER” Write The Lettere The Way It Is Printed On The Slide Once You Observe The Sample Under The Scanning Power Objective, Sketch The Image Of The Lettera Appears In The Viewing Field Letter Under Scanning Power Objective Letter Under Low Power Objective Letter Under High Power Objective What Happened With The Image Of The Letter “e” …

OBSERVING THE LETTER” Write the lettere the way it is printed on the slide Once you observe the sample under the scanning power objective, sketch the image of the lettera appears in the viewing field Letter under scanning power objective Letter under low power objective Letter under high power objective What happened with the image of the letter “e” compared to the one you observed without the micro- scope? Explain What is the fraction of the viewing field occupied by the lettere under scanning and low power? How much of the letter “c” can be seen under high magnification power? How detailed are the images under different magnifications? Correlate the area of the letter observed with how detailed the image is 96 Laboratory Tools The Metric Systems Mice With increasing power of magnification, the observed as the will be the ability to see details will increase or decrease). The previous sentence describes the correlation between the magnification power and there the ability to see detail CARE OF THE MICROSCOPE A clear and sharp image of the object is dependent on clean optics, and the lenses are sometimes subject to dirt deposits and mudges. For that purpose, special lens deaming permit bewed no paper towe shirt sleeves, or other fabric. Simply take a piece of the lens cleaning paper supplied in the lab. dit twice, and with a circular motion clean the lens of the ocular or the objective leas each separatelem with a separate piece of paper. If the smudge is persistent the use of lens ceaning liquid might be required Apply a small amount of the cleaning liquid on a folded lens ceaning paper and clean the lens in the same circular motion followed by a dry lens paper. In some cases, cleaning the specimen itself might be warranted THE DISSECTING MICROSCOPE As the name indicates, this type of microscope can be used for dissection and observation of relatively big specimens. Structurally, this microscope is much simpler than the compound microscope (Figure 4.4) has several advantages large working distance between the objective and the stage, almost 3-D viualis tion of specimens, and stereoscopic vision. But it also has several disadvantages limited magnification power and consequently lower resolution power and lack of fine movement of the samples There are some similarities in the organization of the compound and dissection microscopes, with the dissection having fewer parts and some specific only to the dissection microscope. Two eyepieces foculars are mounted to a head, with one fixed objective below. The stage is usually a glassplate and it cannot be moved, since it is part of the microscope base. The light source is movable and can illuminate the sample from above (reflected light) or below (transmitted light) depending on the specimen properties. Within the base and below the stage, a mirror is used to direct the transmitted light and focus it on the specimen On each side of the arm there is a single focusing knob. A room control knob located at the head allons for virtual increase or decrease of the magnification power achieved by the oculatiobjective combination It works similarly to the zoom button on camera without moving the object in focus appears to come closer (become bigger) or further away become smaller) What is the total magnification power of the ocular objective combination (Usually the objective mani fication power is 7x) Look at the lowest and highest settings of the room knob. Calculate the range of the possible total magnifi cation powers under various settings. List two advantages of the dissecting microscope. List two disadvantages of the dissecting microscope The letter ‘e’ under microscope 31