A laser shines 630-nm light through a grating producing a first-order (m = 1) maximum at an angle of 30°. A second laser produces a first-order maximum with the same grating at 20°. What is the wavelength emitted by the second laser?
a. 945 nm b. 651 nm
c. 420 nm d. 431 nm
d
Physics & Space Science
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