A convex lens of focal length 40cm is he...

A convex lens of focal length 40cm is held at a distance 12cm coaxially above a concave mirror of focale length 18cm.

Q. If the convex lens is replaced by a glass plate of thickness 6cm, refractive index `mu=(3)/(2)` and gives rise to an image coincident with itself, then the value of d is equal to

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