  New approach to the description of a gravitation using analogy between the
optical and mechanical phenomenon is advanced. For this purpose in extended
(1+4)-dimensional space G(1,4) the gravitational effects are considered: the
speed of escape, red shift, radar echo, deviation light and perihelion
precession of Mercury. It is shown, that methods of the Extended Space Model
(ESM) give the same outcomes, as General Theory of Relativity (GR). The various
ways of introduction of refraction index are discussed, which appropriate to
the gravitational field.
