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				| 1. | When instrument is at P the staff readings on P is 2.748 and on Q is 1.824 when instrument at Q the staff readings on P is 1.606and Q is 0.928. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find combined effect correction for curvature and refraction? | 
| A. | 0.057 m | 
| B. | 0.069 m | 
| C. | 0.058 m | 
| D. | 0.048 m | 
| Answer» C. 0.058 m | |