How confident are you that this person really took Ms. C's lunch? How confident would you feel with only one or two pieces of evidence?

In science, why is it important to have more than one piece of evidence to support your claim?

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