Zheleznyak A. Optical observations of gravitational lenses

The object: gravitationally lensed quasars (GLQ), microlenses; the goals: the structure and brightness variation of GLQ components; the methods: high-resolution imaging, CCD photometry; the newness: the information about positions and brightness of components for 20 GLQ was obtained; the lensing galaxy of GLQ SBS1520+530 was detected in optical range; the time delay for Q0957+561 (417.105 days) was measured, on the base of which the Hubble constant 64+-13 кm/s*Мpc was calculated; fast flux variation for Q0957 +561 А,В components was detected, whereas no such variation for А-D components of GLQ Q2237+0305 was found; the method for microlensing searches on the globular cluster was proposed, 28 variable stars in the globular cluster M15 were discovered.