About Light

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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

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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

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

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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

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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

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