Two plane mirrors intersect at right angles. A laser beam strikes the first of them at a point $d=10\mathrm{.}0cm$ from their point of intersection, as shown in $($Figure $1).$

Figure

$1$ of $1$

Part A

For what angle of incidence at the first mirror will this ray strike the midpoint of the second mirror $($which is $s=28\mathrm{.}4cm$ long$)$ after reflecting from the first mirror?

Express your answer in degrees.

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