a needle placed 45 cm from a lens forms an image on the screen is 90 cm on other side of lens identify the type of lens and find its focal length and size or needle is 2 cm what is the size of image
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a needle placed 45 cm from a lens forms an image on the screen is 90 cm on other side of lens identify the type of lens and find its focal length and size or needle is 2 cm what is the size of image
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