When using the sign convention for spherical mirrors, which direction along the principal axis is considered positive?

Question

When using the sign convention for spherical mirrors, which direction along the principal axis is considered positive? — Exam MCQ

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A. To the right of the origin (along + x-axis) — Most solids expand when heated because increased thermal energy causes their particles to vibrate more strongly and their average separation to increase.

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B. To the left of the origin (along - x-axis)

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C. Upwards from the principal axis

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D. Downwards from the principal axis

When using the sign convention for spherical mirrors, which direction along the principal axis is considered positive?

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