1- Define refraction index? What its depending parameters? Value for air and water?

4. What is the critical angle for light passing from diamond to air if the index of refraction of diamond is 2.42?

6) A glass plate with an index of refraction of 1.57 is immersed in an oil having a refractive index of 1.40. What is the critical angle? and which path is the appropriate path for the light to travel for total internal reflection to occur? From oil to glass, or glass to oil? Explain.

36. What is a possible physical reason for the increase in slope of this TX graph? X (distance) a. There may be a low velocity layer that is detectible with refraction data. b. The dip of a refracting horizon steepens half way along the portion observed by the survey c. The first two segments of the graph are both direct arrivals. d. The thickness of the overlying layer decreases with distance. T (time)