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An object is placed at 60 cm from a concave lens. The image is formed at a distance of 20 cm from the optical center. Find the focal length of the lens? Is the lens coverging or diverging? One who wants brainlist mark, answer this question. I will follow you..... |
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Answer» he lens is concave the object distance and the IMAGE distance, both will be negative.Given that:u = -60 cmv = -20 cm We know that:1/F = 1/v - 1/u=> 1/f = -1/20 + 1/60=> 1/f = (-3+1)/60=> 1/f = -2/60=> 1/f = -1/15Thus, f = -15 cm SINCE the lens if concave, it is a DIVERGING lensThanks! |
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