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Gravitational lensing of background compact objects like active galacticnuclei and quasars, by extended intermediate mass lenses such as globularclusters and and dark matter clumps with masses 10^5 - 10^8 M_sun, isconsidered. It is shown that observational study of the galaxy-quasar'sassociations is a powerful direct observational test of the nature of massivegalaxy haloes. Optical interferometric observations with VLTI and Keckinstruments are able to constrain masses and number of substructure haloobjects. Evidence of gravitational lensing by globular clusters in haloes ofspiral and elliptical galaxies is presented.

Constraining the nature of galaxy haloes with gravitational mesolensing of QSOs by halo substructure objects