Surveying - Civil Engineering Questions and Answers

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Pick up the correct statement from the following :

in astronomical telescope, the rays from the object after refraction at the objective are brought to a focus before entering the eyepiece to produce a real inverted image in front of the eye piece

in Galileo's telescope, the rays from the object get refracted at the objective and are intercepted by the eyepiece before a real image is forme

a line passing through the optical centre of the objective traversing through the eyepiece, is called line of sight

the line of sight which passes through the intersection of cross-lines marked on a diaphragm fixed in front of the eyepiece in a plane at right-angles to the axis, is called the line of collimation

all the above.

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