In the long sights, the horizontal line of sight doesn’t remain straight but it slightly bends downwards having concavity towards earth due to ____________

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1.	In the long sights, the horizontal line of sight doesn’t remain straight but it slightly bends downwards having concavity towards earth due to ____________
A.	Refraction
B.	Radius of earth
C.	Curvature of earth
D.	Parallelism
Answer» B. Radius of earth

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