Civil Engineering - Surveying - Discussion


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

[A]. f = f1 + f2
[B]. f = (f1 + f2)
[D]. none of these.

Answer: Option C


No answer description available for this question.

Abhijeet said: (Aug 18, 2015)  
I want answer this questions please.

Nayila Salim Almanji said: (Feb 11, 2017)  
I want the description of this answer. Please explain it.

Rani said: (Feb 12, 2018)  
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.

Rabindra said: (May 1, 2018)  
Nice explanation, thanks @Rani.

V.V.Savaliya said: (Oct 11, 2018)  
Thanks @Rani.

Aakash said: (Oct 30, 2018)  

Jay said: (Jan 22, 2019)  
Thanks @Rani.

Muhammad Umar said: (Feb 1, 2020)  
Well explained @Rani.

Kanaka Raju said: (Sep 21, 2020)  
Thanks for the explanation @Rani.

Kanaka Raju said: (Sep 21, 2020)  
Thanks all.

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