You didn't mention the type of mirror, so I am doing for both concave and convex mirror.
Please answer whichever was asked.
Comment in case any doubt before submission
Case 1) For convex mirror
1/f = 1/v + 1/u
1/2.5 = 1/ v - 1/1.5
v = 0.94 cm
Image height
h' = h v / u
h' = 1 * 0.94 / 1.5 = 0.625 cm
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Case 2) If mirror is concave
-1/2.5 = 1/v - 1/1.5
v = 3.75 cm
Image height
h' = 1 * 3.75 / 1.5 = 2.5 cm
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