Magnification & Scale Bar Calculations #1 - Practice

How many microns (µm)= 1 mm?

1,000

How many nanometers (nm)= 1 micron (µm)?

1,000

How many nanometers (nm)= 1 mm?

1,000,000

To calculate magnification we use......

image size / actual size

To calculate image size we use.....

actual size x magnification

To calculate actual size we use.....

image size / magnification

If the image measures 100 mm and the scale bar is is 50 µm, what is the magnification?

2,000 x

If a scale bar measures 32 mm and it states it's length is 100 µm, what is the magnification?

320 x

If a bacteria image measures 450 mm and the magnification is 15,000x, what is the actual size of the bacteria?

30 µm

An ant measures 2 mm in length. If it is observed at 20x magnification, what length should the scale bar be drawn at?

40 mm

Josie measured the scale bar image to be 80 mm. What is the magnification of this electron micrograph?

160X

Serena measured the image of one of the bacterial cells to be 32 mm. If the magnification of the image is 8,000X, what is the actual size of the bacterial cell?

4 μm

If each division is 100 µm, what is the size of this organism?

400 µm

What steps should Burt use follow to calculate the actual size of each bacterial cell?

Step 1: Calculate the magnification by measuring the scale bar image / actual size

Step 2: Measure image of bacterial cell / magnification

Magnification is determined by . . . .

multiplying ocular and objective magnifications

The higher the magnification, the ________ you see of the specimen.

Less

This is the term given to the area you can see under the microscope.

Field of view

A microscope that uses a stream of electrons to form magnified images of objects

Electron Microscope