Question

The line of sight is kept as high above ground surface as possible to minimise the error in the observed angles due to

a.

shimmering

b.

horizontal refraction

c.

vertical refraction

d.

both shimmering and horizontal refraction.

Posted under Civil Engineering

Answer: (d).both shimmering and horizontal refraction.

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Q. The line of sight is kept as high above ground surface as possible to minimise the error in the observed angles due to

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