B1 Cells & Organisation

Question 1

What is used to form an image in a light microscope?

Answer 1

A beam of light

Question 2

What is used to form an image in an electron microscope?

Answer 2

A beam of electrons

Question 3

What is the magnification and resolving power of a light microscope?

Answer 3

x2000 magnification (school microscopes usually up to x400)

200nm resolving power

Question 4

What is the magnification and resolving power of an electron microscope?

Answer 4

x2,000,000 magnification

0.2nm resolving power

Question 5

Comparison between light and electron microscopes

Answer 5

Light - can view living objects, cheap, easy to carry around

Electron - cannot view living objects, expensive, need to be kept in special conditions

Question 6

What are the two types of electron microscope?

Answer 6

Transmission electron microscope - gives 2D images

Scanning electron microscope - gives 3D images but lower magnifications

Question 7

What is the equation that relates magnification, image size and object size?

Answer 7

Magnification = image size/object size