Surveying - Civil Engineering Questions and Answers

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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 = $\frac { 1 } { 2 }$ (f1 +f2)

$\frac { 1 } { f }$ = $\frac { 1 } { f1 }$ + $\frac { 1 } { f2 }$

none of these.

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Answer : Option C

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