Data Harvest EasySense Snelstarthandleiding - Pagina 8
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EASYSENSE Laser module with Optical slides
5. Record the information in a table as shown below.
Gratings (lines/mm)
N
62.5
O
50
P
25
Calculate the distance between the slits (d) on the diffraction grating
using the formula
λ = the wavelength of the Laser.
Sin
= (s/r) = the separation between the fringes on the screen (s) divided by the distance
from the optical slide to the wall (r).
Example from results using diffraction grating (N)
Wavelength of Laser = λ = 650 nm = 650 x 10
Measurement across 10 bright spot spacings (10 s) = 428 mm, so s = 42.8 mm = 42.8 x 10
Distance from slide to wall (r) = 1158 mm = 1158 x 10
-3
So Sin
42.8 x 10
-3
1158 x 10
-9
d = 650 x 10
= 17547 x 10
0.0369
Note: The stated value of the distance between slit set N = 16.0 x 10
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https://data-harvest.co.uk/warranty.
Note: Data Harvest products are designed for educational use and are not intended for
use in industrial, medical or commercial applications.
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Distance from slide
to wall (r)
-9
= 0.0369
-9
-6
= 17.5 x 10
Separation (s)
m (as calculated in the previous investigation).
-3
m
Prefix Help Chart
Prefix
Name
Meaning
m
milli
Divide by 1 000 i.e. 10
μ
micro
Divide by 1 000 000 i.e. 10
n
nano
Divide by 1 000 000 000 i.e. 10
-6
8
DS058
Calculated distance
between slits (d)
d
sin
-3
-3
-6
-9
m