Magnification and FOV calculations

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

• 14x
• 6x
• 40x
• 2.5x

It the eyepiece lens 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

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

• micrometres

• centimeters
• meters
• minimeters

How many microns (µ) are in a millimeter (mm)?

• 10 µ
• 100 µ
• 1,000 µ
• 0.1 µ

The know 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 know field of view with an ocular of 5x and an objective of 10x is 5,000 µ, what is the new field of view if the objective is increased to 20x?

• 10,000 µ
• 2,000 µ
• 625 µ
• 2,500 µ

Which of these pictures most likely shows a plant magnified under a microscope?

• 
• 
• 
• 

To calculate magnification we use...

• image size x actual size
• image size ÷ actual size
• actual size ÷ image size