# What is the wavelength of light used?

Monochromatic beams are passed on the diffraction grid with a lattice count of 100 lattice/cm of light undergoes dark diffraction to three measured within 5.5 mm of light center, gap distance to the screen 40 cm. What is the wavelength of light used?
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brodireo1
From the question, it is given that-
Lattice count of diffraction grid:
Distance between dark and 3rd maxima:
Distance between grating lit and screen:
To determine the wavelength of light used in diffraction.
From the question we have:
N = 100 lines/cm
Distance between two grid:
Wavelength of light:
Thus the wavelength of light used for diffraction is 458.3 nm.