Abstract
The focussing of gravitational radiation by the interior and exterior gravitational field of a Newtonian gravitational lens is considered. A graphical method for determining the caustic structure of a Newtonian gravitational lens is presented and the caustic structure of a solar type gravitational lens is discussed. Estimates of the amplitude magnification in the caustic region indicate that waves with frequencies less than a critical cutoff frequency ω c are not amplified significantly. For a lens of massM this cutoff frequency is ω c ≈(10-1πM)-1; for the Sun ω c ≈104s-1.
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