Magnification is the ratio between height of the image to height of the object i.e.,$\text{m}=\frac{\text{height}\text{of}\text{image}}{\text{height}\text{of}\text{object}}=\frac{-\text{v}}{\text{u}}$

i)If ‘m’ is $+\text{ve}$ the image is virtual and erect.

Ii) If ‘m’ is $-\text{ve}$ the image is real and inverted.

iii)If$\text{m}>1$ , image is bigger than the object.

iv) $\text{m}<1$ image is smaller than the object.

v)If$\text{m}=1$ image size is equal to object size.

vi)Magnification can also be written as $m=\frac{-\text{image}\text{distance}}{\text{object}\text{distance}}$

A 1 cm object is placed perpendicular to the principal axis of a convex mirror of focal length 7.5 cm. Then the object should be placed infront of the mirror at a distance to get the size of the image as 0.6 cm is