What are the precautions that are to be taken while determining the focal length of the convex lens?

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Answer the following question.
List four precautions which a student should observe while determining the focal length of a given convex lens by obtaining an image of a distant object on a screen.

Following are the precautions while making the image by the help of convex lens: 1) Fix the convex lens vertically in the lens holder. 2) The base of the lens and white screen should be in a line with the measuring scale. 3) Record the position of the lens and screen only when a well-defined sharp image is formed.

4) There should not be an obstacle in the path of the convex lens.

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