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In order to measure the wavelength of a laser, which of the three approaches would you...

In order to measure the wavelength of a laser, which of the three approaches would you expect to produce the largest error.

- Single Slit Diffraction

- Double Slit Diffraction

- Diffraction Grating

We know that in order to calculate the wavelength, we have to measure Xn for each order. Which procedure would be the least precise in this case?

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