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This question belongs to Civil Engineering Surveying

Surveying

?

$$\alpha $$ and $$\beta $$ are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is

A) $$\frac{{{\text{h}}\tan \alpha }}{{\text{S}}}$$ B) $$\frac{{{\text{h}}\tan \beta }}{{\text{S}}}$$ C) $$\frac{{{\text{h}}\left( {\tan \alpha + \tan \beta } \right)}}{{\text{S}}}$$ D) $$\frac{{{\text{h}}\left( {\tan \alpha - \tan \beta } \right)}}{{\text{S}}}$$

Answer & Solution

Correct Answer: Option C

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