Question

Every distance must be measured from
pole​

Answer 1

Explanation:

all distances parallel to the principal axis measured from ... According to Cartesian sign convention all distances of a mirror is to be measured from its poles in the direction of incident ray. ... An object is placed at a distance of 25 cm from a concave mirror focal length of 15 cm.

Answer 2

Answer:

In modern US customary units it is defined as 16 1⁄2 US survey feet, equal to exactly 1⁄320 of a surveyor's mile, or one-fourth of a surveyor's chain, and is approximately 5.0292 meters.

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