An internal focussing type surveying telescope, may be focussed by the movement of-A-objective glass of the telescopeB-convex lens in the telescopeC-concave lens in the telescopeD-plano convex lens in the telescope.-C-concave lens in the telescope

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The correct option is  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.

Surveying

Q1: An internal focussing type surveying telescope, may be focussed by the movement of

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Surveying

Q1: An internal focussing type surveying telescope, may be focussed by the movement of

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