Question

write the procedure of an activity to find the focus of a concave mirror?

Answer 1

Answer:

To find the focal length of convex mirror and concave lens, you will need to use the mirror formula.

Here is an activity to find approximate value of focal length of concave mirror :-

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).

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

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

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

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

HOPE IT'S HELPFUL

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Answer 2

Answer:

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.

Explanation: