II. Read the following passage and fill in the gaps with one suitable word ( 5p) What is the truth about light wave theory? ……56……. many years, scientists were in disagreement. Newton hypothesized that light traveled ……57…….. in a denser medium, like a wave. On the other hand, Christian Huygens in 1690, postulated that light wave slowed down in a denser medium, like particles. The problem is that it was impossible to ………58……. the speed of light accurately. However, in 1850, Leon Foucault made the first accurate ……59…. His result supported the wave theory for light. The theory was accepted until the late 19th century when Einstein discovered that light striking a surface caused particles to …60…….. their speed. This marked a return to contradiction and disagreement.