Oh-5 Optical Crystals
Aim
To demonstrate diffraction from a crystal lattice using optical apparatus.
Apparatus
- Laser
- Optical bench
- Optical carriers
- Slide projector
- PASCO® "Optical Crystals
Leitz Attachment Apparatus.
Description
The Pasco optical crystals consists of 28 photographic emulsion patterns positioned on seven individual plates. These allow diffraction patterns to be observed due to 1, 2 and 3 dimensional crystals. The laser is directed onto the slide which is mounted on a short optical bench and the resulting pattern is then displayed on a ground glass screen. Alternatively a Video monitor may be used for enlargement.
Each plate has four optical crystals as follows
PLATE 1. a) dots. Random array.
b) c) d) Single row of dots with various spacings
PLATE 2. a) Two parallel rows of dots
b) Three parallel rows of dots
c) Four parallel rows of dots
d) Rectangular lattice of dots
PLATE 3. a) One row of dots
b) Two rows of dots at a 60° degree angle
c) Three rows of dots each at a 60° degree angle
d) Full hexagonal array of dots.
PLATE 4. a) Two identical layers of dots in random array
b) Two layers of dots in hexagonal array
c) d) Two rows of dots in rectangle array (various spacings)
PLATE 5. a) b) Random array of asterisks (two sizes)
c) d) Random array of S's (two sizes)
PLATE 6. a) Random array of A's
b) One row of A's
c) Rectangular array of A's
d) Hexagonal array of A's
PLATE 7. a) Rectangular array of dots
b) Face centred rectangular array
c) Side centred rectangular array
d) Array of dots in sets of three