The lake is a reflecting surface just as the mirror, but it also shows the depth and mystery that the mirror does.
The lake will capture the heart and mind, just as the mirror does.
In second stanza,The poetess has replaced the mirror with a lake to add a new dimension to it which is depth.The lake has depth.Both the mirror and lake have the quality of reflecting the image of what appears before them.Just as anything falls  and drowns into the lakes,the youth and the beauty of women seems to have drowned in the mirror.
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