Q4 (I)An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focussed image can he obtained? Find the size and the nature of the image. (II) An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.
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The image of the object which was kept 27 cm away from the mirror is formed at 54 cm in front of the mirror. The screen can be placed 54 cm to the left of the mirror to get the image.
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