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Selective amplification of the line and continuum source by microlensing in alensed quasar can lead to changes of continuum spectral slopes and line shapesin the spectra of the quasar components. Comparing the spectra of differentcomponents of the lensed quasar and the spectra of an image observed indifferent epochs one can infer the presence of millilensing, microlensing andintrinsic variability. Especially, microlensing can be used for investigationof the unresolved broad line (BLR) and continuum emitting region structure inactive galactic nuclei (AGN). Therefore the spectroscopic monitoring ofselected lensed quasars with 3D spectroscopy open new possibility forinvestigation of the BLR structure in AGN. Here we discuss observationaleffects that may be present during the BLR microlensing in the spectra oflensed QSOs.

3D Spectroscopy as a Tool for Investigation of the BLR of Lensed QSOs