21. What is the name of the type of light that is produced by passing an electric current through a gas?
a) Incandescent light
b) Fluorescent light
c) LED light
d) Laser light
22. What is the name of the type of light that is produced by a semiconductor?
a) Incandescent light
b) Fluorescent light
c) LED light
d) Laser light
23. What is the name of the type of light that is produced by the stimulated emission of radiation?
a) Incandescent light
b) Fluorescent light
c) LED light
d) Laser light
24. What is the name of the process by which the human eye adjusts to changes in light levels?
a) Adaptation
b) Accommodation
c) Refraction
d) Reflection
25. What is the name of the part of the eye that controls the amount of light that enters the eye?
a) Iris
b) Pupil
c) Lens
d) Retina
