an object is placed 30 cm from the lens so that a real image is obtained on the screen at a distance of 40 cm from the lens calculate:: (1)focal length of lens(2)power of lens (3)magnification nature oflens
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an object is placed 30 cm from the lens so that a real image is obtained on the screen at a distance of 40 cm from the lens calculate:: (1)focal length of lens(2)power of lens (3)magnification nature oflens
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