Question

Describe an activity to find the focal length of a concave mirror.​

Answer 1

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1.Fix concave mirror to mirror holder and place it on a plane surface (say a long table). Turn the face of mirror towards a distant object (may be candle).

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2.Now adjust the screen ,candle and the mounted concave mirror so that they are all on the principal axis.

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3.Move the screen back and forth and determine the position for the brightest clearest  image

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4.Measure the distance between the concave mirror and the screen with a metre scale. Record your observations in observation table. 

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5.Repeat the experiment two or three times and find the mean value of the focal length.

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