Perhaps its a typo — maybe they mean the height at $ x = 15 $? But question says at the center.

March 11, 2026

Perhaps its a typo — maybe they mean the height at $ x = 15 $? But question says at the center.

**Why “$ x = 15” Is Rising in Conversations — But Actually

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So depth at center is $ y(0) = 0 $. But likely misinterpret.
Wait — perhaps they mean height difference? But parabola opens upward. At center, its flatest.
Re-reading: depth $ y $ at the center — but center is $ (0,0) $, $ y = 0 $. But thats trivial.
Alternatively, perhaps its a misphrasing — center means vertex. So depth at center is 0.
Wait — perhaps the mirror is shaped to reflect light to focus, and $ y $ is depth from rim to center? But no rim given.
But likely the intent is: what is the depth of the mirror at the edge relative to center? But not asked.

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