Question

1 A horizontal cylindrical tank 2.20 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 water and aims a light beam toward the center of the water sur- face (Fig1). You observe that when the laser has moved a distance S = 1.09m or more (rneasured along the curved surface) from the low- est point in the water, no light enters the gas. (a) What is the index of refraction of the gas? (b) What minimum time does it take the light beam to travel from the laser to the rim of the tank when S1.09m? ii. S1.09m? Figure 1: Gas Laser

Answer 1

Ans ะ 360 x 109 T X10) 56, 구구。 Toting cpvacu ve index of wwer #r33, we hove Sin 56. npauive inden of go 1.33 Time needeo2 20 95 nsee CS has = 4.83 nsec. ii) for the lost im, Hime reedeal 1.1 6:94 tenue, toHad time = 4.呼= 4.B++ nsec.