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| 1. |
To study the focal length of concave mirror |
| Answer» The concav mirror form the image at the focal length when object at infinite so bring the mirror at any open place and place it in the direction of sun and place a cardboard in feont of mirror and bring closer and closer when ever you get the clear patch of a small circle we get the focus point of the mirror .Measure the distance from this point to the mirror we get the focal length of the mirror. | |