A diffraction grating has $4.00 \times {10^5}$ lines per metre. A beam of light of wavelength $589 \times {10^{ - 9}}m$ is incident normally on the diffraction grating.
What is the angle between the second-order maximum and the direction of the incident beam of light?
1 )
${13.6^ \circ }$
2 )
${27.3^ \circ }$
${28.1^ \circ }$
4 )
${56.2^ \circ }$
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