Determind the principle focus and approxe focal length of a conceve mirror ( Describe by using an activity).
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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.
Hold the concave mirror facing some distant object like a tree. Hold a cardboard screen in front of the mirror. Adjust the position of the screen so that a sharp image of distant object is formed on the screen. The distance of screen from the mirror gives us the approximate focal length of the concave mirrror.
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