Question: 12. The formula 1 1 f b 1 - + a gives the relationship between the focal length, f, of a lens; the object's

12. The formula 1 1 f b 1 - + a gives the relationship between the focal length, f, of a lens; the object's distance, b, from the lens; and the image's distance, a, from the lens. Find an expression for b (isolate b), the object's distance from the lens. State restrictions. (4 marks)

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