Q

If a point is located below the principal axis of a spherical mirror, what sign is assigned to its perpendicular distance according to the sign convention for spherical mirrors?

RRB JE 20/02/2026 / 9:00 AM - 10:30 AM 2026
✓ Answer: D Negative
Work is W = F s cosθ. If there is no displacement, s = 0, so the work done is zero even if a force is applied.
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