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Surveying

Q1: Cross hairs in surveying telescopes, are fitted

A in front of the eye piece.

B at the optical centre of the eye piece

C in the objective glass

D at the centre of the telescope

ANS:D - in front of the eye piece.

The cross hair is not a point that can place at the optical centre it is a diagram in the front of the eye piece. Given Answer is correct because Crosshair is placed on an optical center of the diaphragm which is in front of an eyepiece.
 



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