An object 4 cm height is placed at 15 cm in front of a concave lens of focal length 10 cm. at what distance from the mirror should a screen be placed to obtain a sharp image of the object. Calculate the height of the image.
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Explanation: The "u" distance of the image is given as -15 cm while the focal length of the object is given is -10 CM. After knowing the distance of object to be placed let us see the formula for magnification given by . for the purpose of getting an image that is sharp it should be placed at 30 cm.
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