Electromagnetism, force between dipole and grounded plane

Homework Statement

An electric dipole is located at a certain distance from a grounded plane. What force does the dipole exert on the plane?

(The answer is to be expressed as an equation. No data were given, only the above text)

Homework Equations

I am not sure about this, but the course is about "classical" electromagnetism. I would suspect that coulombs law should be used since the question is about the force between charged particles/objects.

$$F = \frac{Q_{1}Q_{2}}{4 \pi \epsilon_{0} r^{2}}$$

The Attempt at a Solution

At first I just thought that the grounded plane would have no net charge and thus the dipole and plane could not affect eachother. I now know that this is isn't true but I'm not sure why. A coursemate told me that the dipole should be treated as two point charges and that they would have equal but opposite charges (mirrored) in the grounded plane. Unfortunately I didn't get the chance to ask him further questions.

Thankful for help

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