Question

To find the focal length of a concave mirror Rahul focuses a distant object with this mirror. The chosen object should be (1) a tree (2) a building (3) a window (4) the sun

Answer 1

Answer:

4. The sun is right answer.

Answer 2

The chosen object should be a tree in order to find the focal length of the concave mirror.

Explanation:

In order to find the focal length of a concave mirror, we need to

- Insert the concave mirror into the mirror holder and place it on the table. Turn your face in the mirror towards the farthest object (Tree). The selected object should be visible with your naked eyes.

- Adjust the position of the screen so that it forms a clear image of the tree.

- Measure the distance between the concave mirror and the screen with the help of a meter scale. Enter your observations in the observation table.

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

- The measured distance would be the focal length of the mirror.

It cannot be the sun as it merges the light all around and a clear picture is difficult to obtain.

Thus, option 1 i.e. 'A Tree' is the correct answer.

Learn more: Define spherical mirror

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