  Recently, ground-based very high-energy (VHE) gamma-ray astronomy achieved a
remarkable advancement in the development of the observational technique for
the registration and study of gamma-ray emission above 100 GeV. Construction of
telescopes of substantially larger sizes than the currently used 12 m class
telescopes can drastically improve the sensitivity of ground-based detectors to
gamma rays of energy from 10 GeV to 100 GeV. Based on Monte Carlo simulations
we have studied the response of an array of three large area imaging
atmospheric Cherenkov telescopes (IACT) as a prototype for a future large-scale
low energy ground-based experiment. The sensitivity of a three-telescope array
as a function of optical reflector size was investigated here in detail.
