Question: A laser beam is incident at a shallow angle on a machinists ruler that has a finely calibrated scale. The engraved rulings on the scale

A laser beam is incident at a shallow angle on a machinist’s ruler that has a finely calibrated scale. The engraved rulings on the scale give rise to a diffraction pattern on a screen. Discuss how you can use this technique to obtain a measure of the wavelength of the laser light.

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