Visitors at a science museum are invited to sit in a chair to the right of a full-length diverging lens (f1 = -2.80 m) a

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Visitors at a science museum are invited to sit in a chair to
the right of a full-length diverging lens
(f1 = -2.80 m) and observe a friend
sitting in a second chair, 2.50 m to the left of the
lens. The visitor then presses a button and a converging lens
(f2 = +3.50 m) rises from the floor
to a position 1.60 m to the right of the diverging lens,
allowing the visitor to view the friend through both lenses at
once. Find (a) the magnification of the
friend when viewed through the diverging lens only
and (b) the overall magnification of the
friend when viewed through both lenses. Be sure to include the
algebraic sign (+ or -) with your answers.