an image to 2/3 of the size of an object is formed by a concave lens at a distance of 12 cm from it find the focal length of the lens (ONLY ANSWER IF YOU KNOW) CLASS9
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Explanation:
size of image = -2/3 × size of object. m = 12 u. ⇒ f = 7.2 cm. Hence, The focal length is 7.2 cm.
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