Magnification

Question 1

Define resolution. What is limited by? What is it measured in?

Answer 1

1. Ability to distinguish 2 ind objects as sep entities
2. Limited by diffraction of light as it passes through specimen and lens
3. Measured in pixels

Question 2

Define diffraction. How does this relate to diffreaction?

Answer 2

Tendency of light waves to spread around phys obstacles

2. Close struct in spec can make reflected light overlap when it diffracts

Question 3

Why do electron microscopes have a higher resolution?

Answer 3

Electron beam = shorter wavelength t.f. diffraction won’t blur img

Question 4

What is the formula for magnification?

Answer 4

Magnification = image size (mm) / actual size (micrometres)

Question 5

How do we convert:

1. cm into mm?
2. mm into micrometres?
3. micrometres into nanometres?

Answer 5

1. x 10
2. x 1000
3. x 1000