Question

Define principle axis is concave mirrors ​

Answer 1

Answer:

Principal axis: The straight line passing through the center of curvature and pole of concave mirror is called its principal axis.

When object is at centre of curvature ('C'): When object is between 'C' and 'F'

When object is at infinity: When object is beyond centre of curvature('C')

When object is at focus 'F': When object is between 'P' and 'F'

Answer 2

Answer:

The principle focus of concave mirror is a point on its principle axis to which all the light rays which are parallel and close to the axis, converge after reflection from the mirror.

Step-by-step explanation:

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