The image of an object formed by a lens is of magnification -1. If the distance between the object and its image is 60 cm, what is the focal length of the lens? If the object is moved 20 cm towards the lens, where would the image be formed? State reason and also draw a ray diagram in support of your answer.(All India - 2016)
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chal be gadhe apna kam khud karo agar tune ab kuch kha to mu bamdh
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the focal length of the lens is -30cm
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