Question

Why magnification is taken negative for real images and positive for virtual images?​

Answer 1

Answer:

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Explanation:

If image is real, it will be inverted which means height of image will be taken as negative. Also, the height of object is always positive.

Now as magnification = Height of image / Height of object.

Therefore, in case of real image,

Magnification = Height of image (-) / height of object (+)=Negative.

So, Magnification will be negative.

Similarly, if image is virtual, it will be erect.

Therefore, in case of virtual image,

Magnification = Height of image (+) / height of object (+)= Positive

So, Magnification will be positive.

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Answer 2

$\red{Answer:-}$

The question is a very common one.

Magnification is the ratio between the

height of the object and the height of

the image.

In the case of a real image, the height

of the object carries a positive sign

while the height of the image carries a

negative one.

Hence the magnification is negative.

In case of a virtual image, the height of

the image, as well as the height of the

object, carries a positive sign

Therefore, the magnification is positive

in this case.