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Which consequence occurs when the horizon mirror of a sextant experiences thermal expansion?

A)Index error increases drastically
B)Limb scale becomes unreadable
C)Telescope objective cracks instantly
D)Vernier scale locks completely stuck

💡 Explanation

Increased temperature causes differential thermal expansion between the frame and mirrors, inducing angular misalignment via kinematic mounting constraints; this increases Index Error drastically because the sextant's accuracy depends on stable mirror angles, rather than limb becoming unreadable under minor expansion.

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