A grating is set 1.50 m from a screen. laser light of unknown wavelength produces first-order...
A grating is set 1.50 m from a screen. laser light of unknown wavelength produces first-order bright fringes that are separated by 85.0cm from the central maximum. If the grating scale is 600 lines/mm, what is the wavelength of the laser?
a. 1450 nm
b. 944 nm
c. 822 nm
d. 411 nm
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