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I need a software or an apparatus (avaiable in school conditions) to measure wavelengths of visible light. In my lab I use coloured filters to get different colours of light, but I have to measure exact wavelenths.

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This depends largely on what apparatus your school already has. But every school should have a good diffraction grating and a large white screen. You can then do a diffraction experiment and take measurements on the screen. Then using the formula $d \ sin \theta =n \lambda$, you can get wavelengths. See http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html for more information on measuring wavelengths using a diffraction grating.

This method will probably not give you extremely precise results but should work fairly well. Do ask your school if they have any useful software for this purpose.

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  • $\begingroup$ A diffraction grating is the de rigueur tool for a moderate precision wavelength measurement. But why would you be bothered about software for the job? $\endgroup$ – dmckee Jul 28 '16 at 0:41
  • $\begingroup$ Vanja Is this what you want? Note that a direct measurement of visible light never was done, there is only a relation to the intensity distributions on an observers screen, produced by the deflection of light at sharp edges. $\endgroup$ – HolgerFiedler Jul 28 '16 at 5:09
  • $\begingroup$ @dmckee. Software which displays graphs of intensity against position would make measurements more accurate and will also make life easier for us. $\endgroup$ – PhysLab Jul 28 '16 at 7:50

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