The structure of the eye that provides about 80 of the eye's focusing power is the _____.
A) iris
B) pupil
C) cornea
D) lens
Question 2
The electromagnetic spectrum is a continuum of electromagnetic energy that is produced by _____ and is radiated as _____.
A) electric charges; waves
B) magnetism; waves
C) electric charges; magnetism
D) magnetism; electric charges