Question

the lenght of the object is 20cm and height is 20 cm.find the magnification​

Answer 1

Explanation:

Since the image is real.

So the distance of image from mirror is v=−40 cm

The distance of image from object is u=−20 cm

We know ,

f

1

=

v

1

+

u

1

=

−40

1

+

−20

1

f=

3

−40

cm

Now the magnification m=−

u

v

=−2

Height of object h=2cm

Height of image h

1

=∣m∣×h=2×2=4cm