Diffraction Grating №1 Has Half the Lines/cm That Diffraction Grating

question 68

Multiple Choice

Diffraction grating №1 has half the lines/cm that diffraction grating №2 does.When used with a certain wavelength of light,both gratings give first-order maxima.Which of the following statements is true for the same wavelength of light.

• A)Both gratings must also give second-order maxima.
• B)Grating №1 must give a second-order maximum.
• C)Grating №2 must give a second-order maximum.
• D)It is possible that neither grating gives a second-order maximum.

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