Diffraction Grating #1 Has Twice the Lines/cm That Diffraction Grating

question 41

Multiple Choice

Diffraction grating #1 has twice the lines/cm that diffraction grating #2 does. When used with a certain wavelength of light, both gratings give first order (m = 1) maxima. Which of the following statements is true for the same wavelength of light.

• A) Both gratings must also give second (m = 2) order maxima.
• B) It is possible that neither grating gives a second order maximum.
• C) Grating #1 must give a second order maximum.
• D) Grating #2 must give a second order maximum.

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