An object is placed at 15cm from a convex mirror having the radius of curvature 20cm
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The image in a convex mirror is always virtual, upright, and diminished.
It helps to learn that.
The only question really is where the image is. Use 1/u + 1/v = 1/f
With Real Is Positive convention: u=15 and f= -10
1/v = 1/f-1/u = -1/10 - 1/15 = -3/30 - 2/30 = -5/30 = -1/6
v= -6 or 6cm behind mirror.
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