Students are performing an experiment to investigate the transmission of light in a long plastic cable, 3 mm in diameter. Initially, the cable transmitted about 30% of the input light to the output. When the cable was partially immersed in a fluid as shown below, the output changed dramatically. Note that the refractive index of the fluid is greater than that of the plastic. light output Example 60 2004 Pilot Question 5a, Does the output increase or decrease when the plastic is immersed into the fluid? Example 61 2004 Pilot Question 5b, Explain the reasoning behind your answer.

Students are performing an experiment to investigate the transmission of light in a long plastic cable, 3 mm in diameter. Initially, the cable transmitted about 30% of the input light to the output. When the cable was partially immersed in a fluid as shown below, the output changed dramatically. Note that the refractive index of the fluid is greater than that of the plastic. light output Example 60 2004 Pilot Question 5a, Does the output increase or decrease when the plastic is immersed into the fluid? Example 61 2004 Pilot Question 5b, Explain the reasoning behind your answer.