  In this work, we discuss the way in which electric and magnetic dipole
resonances arising in the optical scattering spectrum of non-absorbing
dielectric nanospheres can be accurately approximated by means of simple
explicit expressions that depend on sphere's radius, incident wavelength and
relative refractive index. We find such expressions to hold not only for high
but also for moderate refractive-index values, thus complementing the results
reported in previous studies.
