A lens forms an image three times larger than the object. If the image is erect, what is the magnification?
+ 3
Magnification (m) of a lens describes both the size and orientation of the image compared to the object.
The magnitude of magnification tells how many times larger or smaller the image is, while its sign indicates orientation — positive for an erect image and negative for an inverted image.
Since the image here is three times larger and erect, the magnification is positive and equal to 3.
Hence, the correct answer is +3.
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