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Surveying - Engineering

Q1:

An internal focussing type surveying telescope, may be focussed by the movement of

A objective glass of the telescope

B convex-lens in the telescope

C concave lens in the telescope

D plano-convex lens in the telescope.

ANS:C - concave lens in the telescope

Focussing is done by double concave lens in internal focussing type telescope whereas in external focusing type telescope it is achieved by external movement of objective tube.