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The image of a candle flame formed by a ...

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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