Answer
There are 2 possible values of $m_s$
Work Step by Step
$m_s = \pm~\frac{1}{2}$
For each value of $m_l$, there are 2 possible values of $m_s$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.