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Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 6 (Q.No. 33)
Surveying
33.
Pick up the correct statement from the following :
spherical aberration may be reduced by diminishing the aperture
spherical aberration may be minimised by replacing the single lens by a combination of the lenses.
in telescope objectives, a combination of convex lens and concave lens is used.
in eyepieces, two plano-convex lenses placed at a certain distance apart are used
all the above.
Answer: Option
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