Microscope Measurements and Calculations

This tutorial explains how to measure the size of cells using a microscope by applying a simple analogy of measuring apples on a plate. The video demonstrates how to calculate the size of onion and red blood cells by determining the field of view and the number of cells that fit across it. The tutorial also provides a practical example of converting measurements to micrometers and encourages viewers to explore further with additional resources.

If a plate is 30 cm across and holds 3 apples, what is the diameter of one apple?

• 5 cm

• 10 cm

• 20 cm

• 15 cm

What is the term used to describe the entire area visible through a microscope?

• Depth of field

• Field of view

• Resolution

• Magnification

How do you calculate the size of an object using the fit number?

• Divide the field of view by the fit number

• Multiply the field of view by the fit number

• Subtract the fit number from the field of view

• Add the field of view to the fit number

What is the field of view for onion cells using a 240x lens?

• 0.45 mm

• 0.55 mm

• 0.35 mm

• 0.25 mm

How many onion cells fit across the field of view in the example?

• 3

• 5

• 6

• 4

What is the approximate size of one onion cell in micrometers?

• 70 micrometers

• 80 micrometers

• 90 micrometers

• 100 micrometers

What lens magnification is used to observe red blood cells in the example?

• 60x

• 20x

• 10x

• 40x

How many red blood cells fit across the field of view in the example?

• 30

• 40

• 50

• 60

What is the calculated size of a red blood cell in micrometers?

• 8.5 micrometers

• 5.5 micrometers

• 6.5 micrometers

• 7.5 micrometers

What can students use to take pictures through a microscope?

• A simple cell phone camera

• A professional camera

• A digital scanner

• A video recorder