Which statement correctly defines the term scientific theory?
a)an approximation that makes the experiment easier
b)an explanation for observable phenomena
c)an understanding that is accepted as true
d)an assumption that is generally accepted as correct

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3