In the long sights, the horizontal line of sight doesn’t remain straight but i

Question

In the long sights, the horizontal line of sight doesn’t remain straight but it slightly bends downwards having concavity towards earth due to ____________

Options:

A . Refraction

B . Radius of earth

C . Curvature of earth

D . Parallelism

Answer: Option A
Answer: (a).Refraction

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Question 1. Horizontal line departs from a level surface because of _____________....

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Question 4. When instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When instrument at Q the staff readings on ....P is 126.386. Find combined correction for curvature and refraction?

Question 5. When an instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When instrument at Q the staff readings o....of P is 126.386. Find the error due to collimation?

Question 6. 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 ....R.L. of P is 126.386. Find error due to collimation?

Question 7. 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 126.386. Find combined effect correction for curvature and refraction?

Question 8. When an 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 o....R.L. of P is 126.386. Find true R.L of Q?

Question 9. Atmospheric refraction is _________....

Question 10. Which of the following is an instrumental error?....

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