how do you find the focal length of a lens experimentally
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Answer:i) Place the convex lens on a 'V' stand. . ii) Light a candle and take it far away from the lens along the principal axis. iii) Adjust the screen on the other side of the lens to get a clear image on it. iv) Measure the distance between the 'V' stand and the screen which gives a rough idea of focal length of the lens.
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Take a candle and place it 60cm away from a convex lens such that it lies along the principal axis. Now the most important part is adjust the screen so that you can take the readings of image distance and object distance carefully. Finally after 3 to 4 readings you can find the focal length from the mean of the values.
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