A converging lens has a focal length of 15 cm .At what distance should a screen be placed so that a real image is formed for an object placed at 20 cm from the optical centre? Find the size of the image formed
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Explanation:
Height of image h' = -14cm. Thus, So screen should be placed at a distance of 54cm in front of mirror. Image formed is twice the size of the object and it is real and inverted because both distance and magnification are negative.
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Hence object should be placed at a distance of 10 cm from optical centre.
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