A diffraction grating is used to view the spectrum of light from a helium discharge tube. The 3 brightest lines are red, yellow and blue in colour. In this spectrometer, the distance between the grating and the slit is 30.0 cm and the slit spacing in the grating is 1870 nm. Calculate the wavelength of spectral line C. What is the highest order of spectral line C that can be seen?

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A: λ=690 nm=690×10-7 mD=30 cmDiameter of bright central maximum =0.28 cmd=?

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.