Honors Biology.  Mathematical Model: Total Magnification = Ocular Lens magnification x Objective Lens magnification  Sheila has an ocular lens with.

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Presentation transcript:

Honors Biology

 Mathematical Model: Total Magnification = Ocular Lens magnification x Objective Lens magnification  Sheila has an ocular lens with 5x written on it and a scanning lens of 5x. How much larger is her image than the original specimen?  If Sheila switches to low power which has 10x written on it, how much larger will her image be? What is the new magnification?

 1millimeter = 1000 micrometers  What is the symbol for millimeters?  What is the symbol for micrometers?  Light is composed of frequencies of energies that have their wavelengths measured in nanometers. How is a nanometer related to a micrometer?

 Determine field of view under low power.  Convert millimeters to micrometers  Estimate size of image by determining the percent coverage of the field of view.  Multiply the percentage of coverage by the field of view.

 Field of view 2.0 mm under 100 x

 Determine the field of view in mm under low power.  Convert the field of view from mm to um.  Determine the field of view under high power using the mathematical model below Field of view high power = low power magnification x field of view under low power high power magnification  Estimate the amount of coverage (or percentage) of field of view for that specimen.  Multiply the amount of coverage by the field ov view under high power.

1. Suppose the field of view under scanning is 6 mm across and has a magnification of 50x. What will the field of view be under low power which is 100x? 2. Suppose a specimen takes up 1/3 the field of view under low power (100x) which has a field of view of 1.5 mm, how large is the specimen in micrometers? 3. A microscope has a field of view of 2 mm under low power (100x). A specimen takes up 75% of the field of view under high power (430x). How large is the specimen in micrometers? 4. A microscope has a field of view of 1.75 mm under low power (100x). If 5 specimens can fit across the field of view under high power (400x), how large is the specimen in micrometers?

 Low power 100x has field of view of 1.5 mm.  Viewed under high power with magnification of 430x  What is the diameter of field of view under high power?  What is the approximate size of the elodea cell?