5-23. An object that allows virtually 100 percent of the light striking it to pass through exhibits the property of 1. opacity 2. translucency 3. transparency 4. absorptivity 5-24. When  none  of  the  light  waves  that  strike  a medium pass through it, the medium is termed 1. opaque 2. absorbent 3. translucent 4. transparent 5-25. A ray of light striking a mirror perpendicularly is referred to as the 1. angle of reflection 2. angle of refraction 3. normal 4. reflected light 5-26. What is the term given to the angle between a reflected  light  ray  and  a  perpendicular  light ray? 1. Angle of incidence 2. Angle of reflection 3. Angle of refraction 4. The normal angle 5-27. When   light   passes   through   a   medium   that changes  the  direction  of  the  light,  the  light  is being 1. refracted only 2. reflected only 3. reflected or refracted 4. absorbed and reflected 5-28. When a light ray passes from one medium into another  of  greater  density  at  an  angle  of  45 degrees, how is the light ray affected? 1. It slows and bends away from the normal 2. It slows and bends toward the normal 3. It is reflected at a 45-degree angle 4. It slows, but its path is not altered 5-29. What  are  the  six  distinct  colors  of  the  visible spectrum? 1. Red,   orange,   yellow,   green,   blue,   and brown 2. Yellow, green, blue, orange, violet, and red 3. Blue,  green,  yellow,  orange,  black,  and white 4. White, black, gray, yellow, blue, and red 5-30. Halos  are  almost  exclusively  associated  with which of the following cloud forms? 1. Cumuliform 2. Stratiform 3. Cirriform 5-31. Which    of    the    following    differences    dis- tinguishes coronas from halos? 1. Coronas are usually much larger than halos 2. The  outer  ring  of  a  corona  is  red,  while  a halo’s is violet 3. Coronas  are  formed  by  refraction  of  light through ice crystals, while halos are caused by the diffraction of light by water droplets 4. Coronas  form  around  the  Sun  and  Moon while halos form only around the Sun 5-32. What color is usually seen on the outer arc of a rainbow? 1. Blue 2. Red 3. Yellow 4. Green 5-33. Mirages are produced when light is 1. absorbed in a very dense cold air mass 2. reflected  off  a  very  hot  surface  such  as  a desert 3. refracted  when  passing  through  layers  of air with highly different densities 4. reflected,  refracted,  and  diffracted  in  hot air 5-34. What is the term given to the phenomena that causes  stars  near  the  horizon  to  twinkle  and change color? 1. Iridescence 2. Looming 3. Superior mirage 4. Scintillation 27