question_answer 66)

    The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

Answer:

                  The image is real as only the real image can be taken on the screen. Here, image distance v = + 80cm Magnification, m = - 3 Object distance, u =? Since, magnification, Nature of image Real, inverted magnified formed beyond 2F Using lens formula, we have cm Positive focal length denotes that lens is convex.