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Light of wavelength 570 nm illuminates a diffraction grating. The second-order maximum is at angle 41.5...

Light of wavelength 570 nm illuminates a diffraction grating. The second-order maximum is at angle 41.5 degrees.

How many lines per millimeter does this grating have?

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Answer #1

Use properties of diffraction of light to find the spacing between gratings and use that to find lines per millimetre as shown below

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