Question

focal length of concave mirror is: (-ve) or(+ve)​

Answer 1

Answer:

Focal Length - The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. Thus, the focal length of a concave mirror can be estimated by obtaining a 'Real image' of a distant object at its focus, as shown in the figure.

By convention, distances are measured, along the central axis, as positive from the mirror in the direction of the object and negative away from the object. Hence the radius of curvature and the focal length are positive for concave mirrors and negative for convex mirrors.

Step-by-step explanation:

Answer 2

The space between the pole p of concave mirror and the focus F is the focal length of concave mirror. By obtaining the real image of distant image at it focus,the focal length of concave mirror can be estimated as shown in diagram.

the focal length of convex mirror is postive,whereas that of concave mirror is negative. the same can also be proved by using mirror formula:

(1/f = 1/v + 1/u

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