When a real image is cast by a lens, the magnification produced by it is.

positive

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negative

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zero

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Solution

The correct option is B negative
As per the Cartesian convention, distances above the optical axis are taken as positive and distances below the optical axis are taken as negative.

Magnification is the ratio of the height of the image to the height of the object.

In case of a real image, the image is inverted and hence the height of the image has a negative sign, while the height of the object has a positive sign.
⇒ The magnification is negative.

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