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.
b
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