F = C/2
 F x 2 = C
this two formulas can be applied to and fro
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Hold the concave mirror in your right hand and select a distant object (a candle in this case). The selected object should be visible with your naked eyes.Adjust the position of the screen in such a way that it forms a clear image of the candle on the screen.Measure the distance between the concave mirror and the screen with a meter scale.Repeat the experiment two or three times.