Question

the focal length of concave mirror is 40cm.what is it's radius.
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Answer 1

Answer:

Since the focal length is half the length of the radius of curvature. The focal length comes out to be 20 cm.

Explanation:

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Answer 2

Answer:

Acceleration, rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down. ... Acceleration is defined as the change in the velocity vector in a time interval, divided by the time interval.