Data Harvest EasySense Manuel de démarrage rapide - Page 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
Limited warranty
For information about the terms of the product warranty, see the Data Harvest website at:
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.
WEEE (Waste Electrical and Electronic Equipment) Legislation
Data Harvest Group Ltd are fully compliant with WEEE legislation and are
pleased to provide a disposal service for any of our products when their life
expires. Simply return them to us clearly identified as 'life expired' and we will
dispose of them for you.
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