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Is every measurement subject to errors?
Yes. There is no system of measurement that is "perfect" in every way. We work hard to reduce error or uncertainty when we measure stuff, but we cannot eliminate it.
What are the advantages and disadvantages of the Height of Collimation method in surveying?
the advantages of this method was that it is more quick and less calculation needed and the disadvantages, it less accurate compare to the rise and fall method.
What is a synonom for ejected?
eliminate, expel
How is a wave changed by reflection?
When a wave traversing in a medium of less refractive index gets reflected at a medium of greater refractive index then wave undergoes a phase change of pi radians. But if the same reflection takes place as the wave traverses from a medium of greater refractive index to that of less refractive index, then no such phase change. The later reflection is known as total internal reflection. So as light traversing in air gets reflected at glass then phase change of pi radians occurs.
What are the errors committed in measuring accuracy of an object?
gross errors,random errors, and instrumental errors.
Importance of observing face left and face right in surveying?
is to eliminate collimation error
What is Line of Collimation in Levelling?
it is line set out by the optical axis of the instrument ( level). so it is just an imaginary line that describes the ray of light that allowes us to read different values from the leveling staff. this term arose from the fact that in differential leveling in surveying we must construct horizontal line of sight, but due to collimation error the collimation line (i.e. line of sight) will not be 100% horizontal (by horizontal we mean tangent the level surface at the instrument position), instead it will be slightly deviated. so what we are looking to achieve when we eliminate the collimation error (using the 2 peg test) is a horizontal line of collimation.
What are the errors in levelling?
there are few types of errors in levelling...... these arr...... 1- instrumental error 2- collimation error 3- errors due to curvature and refraction 4- some other errors also
What is collimation error?
error in alignment between the optical axis of a telescope & the declination. it is line set out by the optical axis of the instrument ( level). so it is just an imaginary line that describes the ray of light that allows us to read different values from the leveling staff. this term arose from the fact that in differential leveling in surveying we must construct horizontal line of sight, but due to collimation error the collimation line (i.e. line of sight) will not be 100% horizontal (by horizontal we mean tangent the level surface at the instrument position), instead it will be slightly deviated. so what we are looking to achieve when we eliminate the collimation error (using the 2 peg test) is a horizontal line of collimation.
What is the height of collimation?
The height of collimation is the height of the line of sight. It is the vertical distance of the horizontal plane through a telescope.
What is a type of collimation device?
diaphragm
Why is collimation used for telescopes?
Collimation is used for telescopes to make sure the telescopes are perfectly aligned. The reflector will not produce the best image if the aligned is not just right.
How can avoid error in spirit leveling collimation error refraction error division of staff?
Collimation Error: Collimation error occurs when the collimation axis is not truly horizontal when the instrument is level. The effect is illustrated in the sketch below, where the collimation axis is tilted with respect to the horizontal by an angle α: Figure ( ) In this particular example, the effect is to read too high on the staff. For a typical collimation error of 20", over a sight length of 50m the effect is 5mm. If the sight lengths for back sight and foresight are equal, the linear effect is the same for both readings. When the height difference is calculated, this effect cancels: δh = (b + s. α) - (f + s. α) = b - f That is, the effect of the collimation error is eliminated if sight lengths are kept equal.
What is the meaning of the height of collimation?
This term is used in surveying. 'Height of collimation' means height of instrument.Generally this term is used while doing levelling i.e. Measuring elevation of given point.
What is traversing by sideshots?
_ _ _ _ them all!
What is meant by the expression traversing by a binary tree?
you do anything with binary element that is traversing. insertion,deletion, accesing anything.............
What is the purpose of authorization?
Authorization is for authenticating accuracy to eliminate errors or to restrict access.
