45.  The process that creates light by passing an electric current through gas in a tube is:

a)  Chemiluminescence

b)  Fluorescence

c)  An incandescent light bulb

d)  An LED

46.  The speed of light is fastest in:

a) Water

b) Air

c) A vacuum

d) Cold Air

47.  If the refractive index of water is n_w = 1.3, and the velocity of light in air is 3 x 10⁸ m/s, what is the velocity of light in water?

a) 1.5 x 10⁸ m/s

b)  3.21 x 10⁸ m/s

c) 2.31 x 10⁸ m/s

d) 1.9 x 10⁸ m/s

 

48. Plane mirrors produce a:

a) Real image          

b) No image

c) Virtual image

d) Hologram

49.  A dime in a fountain will appear farther away to your eyes because of:

a) Reflection

b) Optical phenomena

c) Refraction

d) Total internal reflection

50.  The best type of mirror to use in a parking garage to see around corners is:

a)  Concave

b)  Convex

c)  Plane

d)  Broken