Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 6 (Q.No. 5)
5.
An internal focussing type surveying telescope, may be focussed by the movement of
Discussion:
2 comments Page 1 of 1.
Dhruv said:
6 years ago
Focussing is done by double concave lens in internal focussing type telescope whereas in external focusing type telescope it is achieved by external movement of objective tube.
(4)
John said:
4 years ago
Thanks @Dhruv.
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