As far as i know the sp3 orbital is a combination of orbitals. But how do we know if we have a hybridised orbital or not?

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    $\begingroup$ There are ways to determine bond lengths (via X-Ray diffraction or, Neutron diffraction) and if bond lengths are found to be equal in a place where we predict it to be by hybridisation, you can say the orbitals are hybridised. $\endgroup$ – Soumik Das Jan 12 '19 at 3:44
  • $\begingroup$ Not an answe but maybe it highlights a bit about sp-hybridizations chemistry.stackexchange.com/questions/89214/… $\endgroup$ – HolgerFiedler Jan 20 '19 at 13:39