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← HistoryWhich consequence occurs when index error increases with sextant use?
A)Cumulative navigational estimate deviations increase✓
B)Mirror silvering degrades faster later
C)Limb graduations become hard to read
D)Telescope optical power starts reducing
💡 Explanation
Cumulative navigation error increases because the increasing index error yields incorrect angular measurements via the **parallax effect** over time; therefore course estimations progressively deviate, rather than simply affecting the immediate readings, although that happens too.
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