39.  The critical angle of glass is 41°.  Which of the following will result in total internal reflection?

a) 44°

b) 40°

c) 38°

d) 20.5°

40.  Myopia is:

a)  A clouding of the lens

b)  Farsightedness

c)  Nearsightedness

d)  Perfect eyesight

41.  A translucent material

a) absorbs the light rays it receives.

b) transmits all the light rays it receives.

c) transmits most of  light rays it receives.

d) reflects the light rays it receives.

42.  Planets and moons are:

a) Luminous

b) Can either be luminous or non-luminous depending on where the Sun is

c) Non-luminous

d) Mercury and Venus are the only luminous celestial objects

43.  The part of the electromagnetic spectrum we can see is called the:

a) Invisible spectrum

b) Colour spectrum

c) Rainbow spectrum

d) Visible spectrum

44.  Total internal reflection will occur if the incident angle is

a) half the value of the critical angle.      

b) greater then the critical angle.

c) the same as the critical angle.

d) less then the critical angle.

 45.  The process that creates light by passing