Question

1. a microscope has a 20 x ocular (eyepiece) and two objectives of 20 x and 45 x respectively:

a.) calculate the low power magnification of this microscope. show your formula and all work.
b.) calculate the high power magnification of this microscope. show your formula and all work.

1. explain why as magnification increases, field of view decreases.
2. what is the advantage of using high power? what is the advantage of using low power?
3. which group of measurement units is correctly arranged in order of increasing size?

a. micrometer, millimeter, centimeter, meter
b. meter, micrometer, centimeter, millimeter

Explanation:

Step1: Recall magnification formula

Microscope magnification = Ocular magnification × Objective magnification

Step2: Calculate low - power magnification

The low - power objective is 20X and ocular is 20X. So, magnification = 20×20 = 400X

Step3: Calculate high - power magnification

The high - power objective is 45X and ocular is 20X. So, magnification = 20×45 = 900X

Step4: Explain magnification - field of view relationship

As magnification increases, the area of the specimen that can be seen (field of view) decreases because the microscope is zooming in on a smaller part of the specimen.

Step5: List advantages of low - power and high - power

Advantage of low - power: Larger field of view, useful for scanning the whole specimen to find areas of interest.
Advantage of high - power: Higher resolution, can see more detailed structures of the specimen.

Step6: Arrange measurement units

1 micrometer ($\mu m$)= 0.001 millimeter (mm), 1 millimeter = 0.1 centimeter (cm), 1 centimeter = 0.01 meter (m). So, the correct order of increasing size is micrometer, millimeter, centimeter, meter.

Answer:

a. 400X
b. 900X

1. As magnification increases, the microscope zooms in on a smaller part of the specimen, so the field of view decreases.
2. Advantage of low - power: Larger field of view for scanning. Advantage of high - power: Higher resolution for detailed view.
3. a. micrometer, millimeter, centimeter, meter