The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. According to new cartesian sign convention, if the image is three times the size of the flame, then the lens is: (a) Concave and magnification is +3 (b) Concave and magnification is - 3 (c) Convex and magnification is - 3 (d) Convex and magnification is + 3
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d. convex lens and magnification is 3
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