Question

Why cross wires are not provided in huygens eyepiece?

Answer 1

But the cross wires are viewed through the eye lens only while the distant object is viewed by rays refracted through both the lenses. Due to this reason relative lengths of the cross wires and the image are disproportionate. Hence cross wires cannot be used in a Huygens eyepiece and this is a disadvantage.

Answer 2

the cross wires are not provided in huygens eyepiece because these cross wires do not intellect by indesiring the meticulous