Question

What is the value of magnification when the size img. formed by a concave mirror is equal to the size of the object?

Answer 1

when object size and image size is equal then magnification is 1 and in case of concave mirror as the image will be real therefore magnification will be -1

Answer 2

The magnification of the concave mirror is -1.

Explanation:

The magnification of the mirror is given by :

$m=\dfrac{-v}{u}$

v is the image distance

u is the object distance

Also, $m=\dfrac{h'}{h}$

h' is the size of the image

h is the size of the object

According to given question, the size of the image formed by a concave mirror is equal to the size of the object.

$m=1$

As the image formed by the concave mirror is real and inverted. So,

m = -1

Hence, this is the required solution.

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