Question

State the meaning of linear magnification. how is it related to object distance and image distance? when is magnification positive or negative?

Answer 1

Answer:

The ratio of the size of the image to the size of the object is called as linear magnification .

It is denoted by m.

for a mirror m = -(v/u)

for a lens m = +(v/u)

if the image formed is virtual then the magnification has positive value and in case of real image, it is negative.

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Answer 2

Magnification, $m=\dfrac{h'}{h}=\dfrac{v}{u}$

Positive magnification shows that the image is virtual and erect while negative magnification shows that the real and inverted.

Explanation:

Linear magnification is defined as the ratio of the size of the image to the size of the object. It is also given by the ratio of image distance to the object distance. It is given by :

$m=\dfrac{h'}{h}=\dfrac{v}{u}$

Where

h' is the size of image

h is the size of object

v is the image distance

u is the object distance

Positive magnification shows that the image is virtual and erect while negative magnification shows that the real and inverted.

Learn more,

Linear magnification

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