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Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 4 (Q.No. 44)
Surveying
44.
Flint glass
has slightly the greater refracting power than crown glass
has roughly double refracting power than that of crown
and crown glass proportions yield the required focal length and neutralise the dispersion produced by the convex lens at the emergence from the concave
all the above.
Answer: Option
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