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List Four Precautions Which a Student Should Observe While Determining the Focal Length of a Given Convex Lens by Obtaining Image of a Distant Object on a Screen. - Science

Question

Short Note

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. 

Solution

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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