Pick up the correct specification of Ramsden eyepiece from the following : - Surveying Quiz

Civil Engineering : Surveying - Quiz(MCQ)

Pick up the correct specification of Ramsden eyepiece from the following :

A)

it consists of two equal piano convex lenses

B)

the curved surfaces of plano-convex lenses face each other

C)

the two lenses are separated by a distance equal to 2/3 of the focal length of either lens.

D)

All of the above

Correct Answer : All of the above

Explanation : * it consists of two equal piano convex lenses
* the curved surfaces of plano-convex lenses face each other
* the two lenses are separated by a distance equal to 2/3 of the focal length of either lens.
* the distance between the diaphragm and the front lens of the eyepiece is kept equal to 1/4 th of the focal length of a lens so that rays from a point on the diaphragm enter the eye as a parallel beam

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A sewer is laid from a manhole A to a manhole B, 250 m away along a gradient of 1 in 125. If the reduced level of the invert at A is 205.75 m and the height of the boning rod is 3 m, the reduced level of the sight rail at B, is_______.

A)

202.75 m

B)

206.75 m

C)

208.75 m

D)

211.75 m

Correct Answer : Option (B) : 206.75 m

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B)

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C)

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D)

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A)

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B)

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C)

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D)

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