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Authors: PETRU T. MOCANU.
from 0 to a point w Є Γ and let 
be the outer normal to Γ at the point w = f[z(t)]. Let denote by 
the angle between and and consider the vector 
starting from w, such that sin Ψ = γ sin ω, where 
and γ is a positive number. We say that the starlike curve Γ = f(C) has the regular refraction property, with index γ, if the argument of the vector is an increasing function of t Є [a, b]. The concept of regular refraction property was introduced in [2] and developed in [3], [4], [5], [6] and [7]. We mention that this concept is closed to the concept of α-convexity introduced in [1]. In this paper we continue to study this geometric property by introducing the concept of regular refraction interval of a given function. We also give a significant example. Key words and phrases. Starlike functions, regular refraction
