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Given focal length of lents (f) = 1.5 cm
Object distance u = - 20 cm , f = 15 cm
We know that
v = 60 cm
The image 1 gets formed at 60 cm to ghe right of the lens and it will be inverted.
Therefore, Distance between lens and mirror will be
d = image distance(v) - radius of curvature of convex mirror
s = 60 - 2f