Microscope Calculations

If the ocular is 10x and the objective is 4x, what is the total magnification?

• 14x
• 6x
• 40x
• 2.5x

If the total magnification is 100x and the objective is 10x, what is the ocular?

• 90x
• 10x
• 110x
• 1000x

It the ocular is 10x, and the the total magnification is 400x, what is the objective?

• 40x
• 410x
• 4x
• 4000x

Field of view is......

• The size of the specimen
• The size of the slide
• The area you can see under the microscope
• The area from which your specimen came

If the ocular is 2x and the objective is 4x, what is the total magnification?

• 8x
• 6x
• 2x
• 80x

Millimeters (mm) are too large a unit at higher magnifications, so biologists use.....

• micrometers

• centimeters

• meters

• minimeters

How many micrometers (µm) are in a millimeter (mm)?

• 10 µm

• 100 µm

• 1,000 µm

• 0.1 µm

The known field of view is 2.5 mm at an ocular of 10x and an objective of 4x. What is the new field of view if you increase the objective to 40x?

• 0.25 mm

• 25 mm

• 250 mm

• 10 mm

Biologists estimate the size of a specimen at high magnification by......

• using a ruler and measuring it
• calculating the field of view then counting how many of the specimen would fit across
• calculating the total magnification
• making a guess based on prior knowledge

If the known field of view with an ocular of 5x and an objective of 10x is 5,000 µm, what is the new field of view if the objective is increased to 20x?

• 10,000 µm

• 2,000 µm

• 625 µm

• 2,500 µm