The intensity of light with wavelength λ traveling through a diffraction grating with n slits at an angle θ is given by i(θ)=n^2 sin^2k/k^2, where k = (πnd sin θ)/λ and d is the distance between adjacent slits. a helium-neon laser with wavelength λ = 632.8 × 10^-9m is emitting a narrow band of light, given by -10^-6 < θ < 10^-6, through a grating with 10,000 slits spaced 10^-4 m apart. use the midpoint rule with n=10 to estimate the total light intensity ^10^-6∫-10^-6 i(θ) dθ emerging from the grating.

It’s the first one, place the point of the compass on point M and draw an arc, making sure the width is greater than 1/2 MN.

An explanation on why:
This is the first step as the second would be doing the same thing except the compass is on N and after that the arcs will intersect. U want it to be more than halfway so the two arcs can intersect and u can create ur bisector by drawing a straight line from the intersected part.
I don’t know if I explained that well I’m not very good at explaining