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Part 1. Monochromatic light from a helium-neon laser (wavelength 613.1 nm) is incident normally on a...

Part 1. Monochromatic light from a helium-neon laser (wavelength 613.1 nm) is incident normally on a diffraction grating containing 4186 lines/cm. Find the angle at which the first-order maximum can be observed. Answer in units of ? . The answer is NOT 17.18 degrees, nor is it 17.1771 degrees.

Part 2. Calculate the angle at which the second-order maximum can be observed. Answer in units of ? .

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Answer #1

The slit width 'd' is,

  

Now the angle, at which the first-order maximum can be observed, can be calculated as,

  

Similarily, the angle, at which the second-order maximum can be observed, can be calculated as,

  

  

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