Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 1 (Q.No. 12)
12.
If f1 and f2 are the distances from the optical centre of a convex lens of focal length f to conjugate two points P1 and P2 respectively, the following relationship holds good
f = f1 + f2
f = 
(f1 + f2)
(f1 + f2)
none of these.
Discussion:
13 comments Page 2 of 2.
Rani said:
8 years ago
In tachometry focal length i.e, the length of focus f (inverse) is equal to the inverse length of (i) length between the lens and intercept staff f1 (ii) length between crosshair and lens f2.
1/f=(1/f1)+(1/f2).
1/f=(1/f1)+(1/f2).
(3)
Nayila salim almanji said:
9 years ago
I want the description of this answer. Please explain it.
Abhijeet said:
1 decade ago
I want answer this questions please.
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