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An image formed on a screen is three times the size of the object. The object and screen are 80 cm apart when the image is sharply focused. (a) State which type of lens is used. (b) Calculate the focal length of the lens. |
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Answer» An image formed on a screen is three times the size of the object. The object and screen are 80 cm apart when the image is sharply focused. (a) State which type of lens is used. (b) Calculate the focal length of the lens. |
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