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I used the formula h'=h(1/(4/3)) where h' is the apparent depth as seen by the observer and h as the actual depth of the object.

the h' of the swimmer is 0.75 m while the mirror is 2.25 m.

I subtracted the 0.75 to 2.25 to get the distance between those 2. And I got 1.5.

Since it's a plane mirror, the image distance is only twice the object distance from the mirror.

My answer is 3 m..

is it correct?