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Measuring Exact Wavelength in Lab

Hi, I need a software or an apparatus (available 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 wavelengths.
Thank you in advance

 

Vanja posted

Answer:

The wavelength may be measured by Diffraction grating experiment, Newton’s rings experiment etc.

http://practicalphysics.org/measuring-wavelength-light.html

http://vlab.amrita.edu/?sub=1&brch=189&sim=1106&cnt=1

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