Question

A 4.4-cm-wide diffraction grating has 2400 slits. It is illuminated by light of wavelength 530 nm .

What is the angle (in degrees) of the first diffraction order?

What is the angle (in degrees) of the second diffraction order?

What is the angle (in degrees) of the first diffraction order

angle = wavelength divided by grating = .00000053/ (.044/ 2400 ) = 0.028 radians = 1.60 degrees

What is the angle (in degrees) of the second diffraction order

the second one is just twice that 0.056 radians = 3.20 degrees

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