UNIT 2 (topic 1) microscopes Flashcards
1
Q
negatives of light microscope
A
low resolution
2
Q
why does the light microscope have low resolution
A
- wavelength of light is too long
- light diffracts when it passes through the gap of a similar length to its wavelength
3
Q
definition of magnification
A
how many times larger an image appears
4
Q
definition of resolution
A
minimum distance between two objects before they appear as one
5
Q
negatives of the electron microscope
A
- image in black and white
- specimens must be dead
- electrons from objects illuminate a screen, where it is visualised - expensive
6
Q
negatives and positives of TEM
A
- very high resolution
- 3D image formed
- thin specimen required
- must be dead
