A parallel beam of light enters a clear plastic bead in diameter and of refractive index

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

A parallel beam of light enters a clear plastic bead

2.50\,\text{cm}

in diameter and of refractive index

1.44

. At what point beyond the bead are these rays brought to a focus?