one
two
three
four
Answer is Right!
Answer is Wrong!
The correct answer is: A. one
A stadia diaphragm is a reticle in a surveying instrument that is used to measure distances. It consists of two horizontal cross wires and one vertical cross wire. The horizontal cross wires are used to measure the distance to an object by stadia measurement. The vertical cross wire is used to center the image of the object on the diaphragm.
The stadia diaphragm is a very important part of a surveying instrument. It allows the surveyor to measure distances accurately and quickly. Without the stadia diaphragm, surveying would be a much more difficult and time-consuming process.
Here is a brief explanation of each option:
- Option A: One. This is the correct answer. The stadia diaphragm has one horizontal cross wire and one vertical cross wire.
- Option B: Two. This is incorrect. The stadia diaphragm has one horizontal cross wire and one vertical cross wire.
- Option C: Three. This is incorrect. The stadia diaphragm has one horizontal cross wire and one vertical cross wire.
- Option D: Four. This is incorrect. The stadia diaphragm has one horizontal cross wire and one vertical cross wire.