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CHE103 > Microscopy > Flashcards

Flashcards in Microscopy Deck (11)
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1
Q

When does refraction occur?

A

When light passes from one medium to another.

2
Q

What is refractive index?

A

The relative speed that light moves through a medium compared to that of a vacuum.

3
Q

What is special about polarised light?

A

It only vibrates in one direction

4
Q

What is fluorescence?

A

The luminescence of an object

5
Q

What is phosphorescence?

A

Long lived fluorescence

6
Q

What is physical evidence?

A

Anything left over in everyday life.

7
Q

What is a stereo microscope?

A

The workhorse microscope (<600x). Used for trace evidence and manipulating small samples.

8
Q

What is a compound microscope?

A

<1000x. Good for fine detail and fibre work.

9
Q

What is a comparison microscope?

A

Two stereomicroscopes strapped together. Used for comparing two samples.

10
Q

What is a polarised light microscope?

A

Used two polarisers (<500x). Used for mineral, fibre and glass identification.

11
Q

What is a scanning electron microscope?

A

Uses electrons instead of light (<500,000x). Used for gunshot residue, must be under a very high vacuum, can only detect elements heavier than nitrogen