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units and measurement

THE LENGTH OF UNIFORM ROD IS 100.0CM AND RADIUS IS 1.00CM.IF LENGTH IS MEASURED WITH METER ROD HAVING LEAST COUNT 1MM AND RADIUS IS MEASURED WITH VERNIER CALIPERS HAVING LEAST COUNT 0.1MM,THE PERCENTAGE ERROR IN CALCULATED VOLUME OF CYLINDER IS?

2000px-Vernier_Caliper_150mm.svg

Asked Megha

Broken spherical mirror and change in focal length

If a spherical mirror broken is there  change in focal length, radius of curvature, image distance,mirror height.

Asked Pawan

Answer. No change. As long as there is no change in the radius of curvature, there is no change in focal length. Mirror forms image based on geometry only as the course of rays are in the same medium.

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