Question

four precaution while determining the focal length of a distant object on a screen​

Answer 1

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Explanation:

1.The lens holder along with lens should be kept vertical throughout the experiment. 2.While measuring the distance, metre scale should be kept horizontal and it must be parallel to the ground. 3.Distance should be measured only when well defined sharp image of the distance object is obtained. 4.Lens and screen should be at same level.

Answer 2

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