3. State how will you determine the focal length of a convex lens by using distant method. Why is the focal length obtained by the above method not exact?
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These samples were then kept under different conditions as below : <br> (a) Both the samples are kept under a fan. ... Since fan helps in the fast movement of the air, water will get more opportunity to evaporate under a fan than inside a cup board. In this case, the outside air will not come in contact with water.
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Explanation:
To determine focal length of a convex lens
The position of the screen should be such that the sharp image of the distant object is obtained on it. The difference between the position of the lens and the screen is equal to the focal length of the given convex lens.
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