About Light

61. What is the name of the phenomenon where light waves spread out as they pass through an opening or around an obstacle?
a) Reflection
b) Refraction
c) Diffraction
d) Interference

62. What is the name of the phenomenon where two or more waves combine to form a single wave?
a) Reflection
b) Refraction
c) Diffraction
d) Interference

63. What is the name of the unit used to measure the intensity of light?
a) Candela
b) Lux
c) Lumen
d) Watt

64. What is the name of the unit used to measure the total amount of light emitted by a source?
a) Candela
b) Lux
c) Lumen
d) Watt

65. What is the name of the unit used to measure the power of light emitted by a source?
a) Candela
b) Lux
c) Lumen
d) Watt