Which of the following is NOT a correct permanent adjustment or requirement for the optical system of a sextant?

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Physics · Optical Instruments

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Correct answer

The index glass and horizon glass must always be perpendicular to each other during measurement.

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Answer 1

The optical axis of the telescope must be parallel to the plane of the arc.

Answer 2

The index glass and horizon glass must be parallel to each other when the index arm reads zero.

Answer 3

The index glass and horizon glass must always be perpendicular to each other during measurement.

Answer 4

The index glass must be perpendicular to the plane of the arc.

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