Question:medium

Which of the following is not a component of the sight vane of a Prismatic Compass?

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Remember the important parts of a Prismatic Compass: \[ \boxed{ \begin{aligned} \text{Sight Vane} &\rightarrow \text{Mirror, Object Vane, Sliding Frame}, \text{Compass Mechanism} &\rightarrow \text{Pivot Pin, Magnetic Needle, Graduated Ring}. \end{aligned} } \] Mnemonic: “Pivot pin holds the needle, not the sight.”

Updated On: Jul 29, 2026

Mirror
Object vane
Pivot pin
Sliding frame

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The Correct Option is C

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