Light from a laboratory source is incident normally at a diffraction grating. The first order maximum of a spectral line of wavelength 600 nm600\text{ nm}600 nm is observed at an angle of 30.0∘30.0^\circ30.0∘.
Light from a distant receding star is observed using the same diffraction grating. The light is incident normally at the grating as before. The speed of this star is 0.10c0.10c0.10c, where c c\,c is the speed of light in a vacuum.
What is the observed angle of the first order maximum of this spectral line from the light of this receding star?
26.7∘26.7^\circ26.7∘
30.0∘30.0^\circ30.0∘
33.0∘33.0^\circ33.0∘
33.4∘33.4^\circ33.4∘
