Please answer these 3

Part A A horizontal cylindrical tank 2 26 m in diameter is half full of water. The space above the water is filled with a pressurized gas of unknown refractive index. A small laser can move along the curved bottom of the What is the index of refraction of the gas? water and aims a light beam toward the center of the water surface (the figure (Figure 1)). You observe that when the laser has moved a distance S = 1.11 m or more (measured along the curved surface) from AEd 6 0 0 ? the lowest point in the water, no light enters the gas. n Submit Previous Answers Request Answer X Incorrect; Try Again Part B How long does it take the light beam to travel from the laser to the rim of the tank when S >1.11 m ? AEQ OE ? ns Submit Request Answer Part C How long does it take the light beam to travel from the laser to the rim of the tank when S do E ? ns Submit Request Answer Gas