  A normalized analytic function f defined on the open unit disk in the complex
plane is in the class SL if zf'(z)/f(z) lies in the region bounded by the
right-half of the lemniscate of Bernoulli given by |w^2 - 1| < 1. In the
present investigation, the SL-radii for certain well-known classes of functions
are obtained. Radius problems associated with the left-half plane are also
investigated for these classes
