Yellow light (600 nm) passes through a diffraction grating. Its first
order (m = 1) maximum occurs at
an angle of 21.2°. What is the slit
separation d?

answer; (arch); good luck

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

i think the answer is a and b

i wish you luck