discraib image distance
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The image distance (sometimes confused with the focal length) is the distance of the image to the centre line of the lens. This is denoted by the symbol di .
Explanation:
ZINGER: An inverted image is magnified by 2 when the object is placed 22 cm in front of a double convex lens. Determine the image distance and the focal length of the lens. Now substitute the di and do values into the lens equation 1 / f = 1 / do + 1 / di to solve for the focal length.
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