(COMPUTER VARIANT)
The aim:to study the phenomena of intenference of light
Instrumentation and appliances: computer.
The short theory
Interference pattern is alternation of light and dark strips (max and min).Distance between two neighboring maxima is defined by the formula:
y = (
l L) d (13.1)
Where: λ length of light wave, radiated by the source, L distance from chink to screen, d distance between the source of light.
Measuring a distance between maxima of interference picture y and distance from sources of light wave which is emanated by laser:
l = (y d) / L (13.2)
Experimental part
1. Choose a filter.
2. Get an interference picture on the screen.
3. Measure with a ruler a width of the interference picture in pixels.
4. Do such experiments for another filters.
5. Define the length of wave every light filter:
λ / y = λ2 / y2 = λ3 / y3= const. λ2 = λy2 /y
So L and d constants as λ / y value, y distance between maxima which is defined on formula: yn = Yn / k.
Number of pixels is measured with screen is measured simultaneously, after that a distance is divided on this number.
Results must be written into the list:
| Color | quantity | λ, length of the way,nm | |
| Red | |||
| Blue | |||
| Green | |||
| Dark-red |
6. Put a thin plate on the way of one of light-pencils. (thickness of plate d = 10 mcm) clarity.For clarity you must take a green filter which when is deviated to maxima when one of the sources is closed by glass plate.(Glass plate is removing on the display by simultaneous pushing of two buttons of the mouse).
7. Measure the indicator of refraction:
(n-1)d=l1-l2
(n-1)d= k λ
n=1+ k λ / d,
where k number of maxima of removing.
8. Put the thick on the way of the beams.
9. Define the thickness of the plate.
10. Make the conclusion.
Authors: Serpetsky B.A., the reader, candidate of physical and mathematical sciences.
Reviewer: Loskutov S.V., professor, doctor of physical and mathematical sciences.
14 64.1 ˲ ֲ ֲͲ زֲ
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