In the ray diagram, a ray refracts at point O. If the line PQ separates two transparent media, which statement BEST describes it?

A) Ray AO is the incident ray, and OB is the normal.
B) Ray OB is the incident ray, and AO is the normal.
C) Ray AO is the incident ray, and OB is the refracted ray.
D) Ray OB is the incident ray, and AO is the refracted ray.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation:

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.