A diffraction grating is used to measure the wavelength of monochromatic light, as shown in the diagram.
The spacing of the slits in the grating is $1.00x{10^{ - 6}}m$. The angle between the first order diffraction maxima is 70.0°.
What is the wavelength of the light?

1 )
287nm
2 )
470nm
574nm
4 )
940nm
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