the image of an object formed by a lens 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
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the image of an object formed by a lens of magnification - 1 if the distance between the object and its image is 60 cm the focal length of the image formed show the diagram is 10 centimetre
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