Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 3 (Q.No. 30)
30.
The construction of optical square is based, on the principle of optical
Discussion:
22 comments Page 3 of 3.
Tushar Methiya said:
6 years ago
Double reflection:
1. Index glass.
2. Horizon glass.
1. Index glass.
2. Horizon glass.
Kuldeep said:
4 years ago
Agree, Double reflection is the right answer.
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