An object \( A \) is at a distance of \( a=36 \mathrm{~cm} \) from ...

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An object \( A \) is at a distance of \( a=36 \mathrm{~cm} \) from a lens with a focal length of \( f=30 \mathrm{~cm} \). A flat mirror turned through \( 45^{\circ} \) with respect to the optic axis of the lens is placed behind at a distance of \( l=1 \mathrm{~m} \). At what distance \( h \) from the optic axis should the bottom of a tray filled with water up to depth \( d=20 \mathrm{~cm} \) be placed to obtain a sharp image of the object at the bottom ?
Figure 5.397
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