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Apparatus; concave mirror mounted on the mirror holder, a metre rule, screen and a distant object.
Set the apparatus such that the mirror faces the distant object.
Adjust the screen infront of the mirror until a sharp image of the distant object is focused on the screen.
Measure the distance between the mirror and the screen using a ruler. This is equal to the focal length of the mirror.
chrispohmomanyi answered the question on September 24, 2017 at 07:25
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