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6) An object is placed perpen-licular to the principle axis of aconvex lens of focal length 10 cm, Thedistance of the object from the o cicalof the lens is 15 cm. Calculatethe position of the image formed.Mention the nature of the imagecentre |
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Answer» f== 20cm u = -30cm v = ? using the lens formula : 1/f = 1/v - 1/u 1/20 = 1/v - 1/-30 1/v = 1/20 - 1/30 1/v = (30 - 20)/600 1/v = 10/600 v = 60cm therefore the image is formed at 60cm from the lens. Magnification = v/u = 60/-30 = -2 D hence, the image formed is real and inverted. |
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