In the given paragraph, the word "align" means "arrange".
The word "align" mean to arrange in a straight line; adjust according to a line; to bring into a line or alignment; to bring into cooperation or agreement with a particular group, party, cause, etc.:
Here in paragraph author wants to say arranging mirrors in striaght line.
A few sentences to help you understand the meaning of the word "align":
Synonyms of word "align" are:
line up
even
order
range
sequence
regulate
straighten
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