Question

Find the position of the image formed in concave mirror of focal length 12 cm when object is placed 20 cm away from the mirror. Also find magnification

Answer 1

Answer:

beyond the circumcenter of the concave mirror

Answer 2

Answer:

Position of the image formed = 30 cm

Magnification = - 1.5

Explanation:

As per the question given data:

Focal length = f = 12 cm

Object distance = u = 20 cm

Let the image distance be = v

According to mirror formula:

$\frac{1}{f}=\frac{1}{v}+\frac{1}{u}$

After putting the value, we get

$\frac{1}{12}=\frac{1}{v}+\frac{1}{20}$

⇒ v = 30 cm

Therefore, the position of the image formed = 30 cm away from the mirror.

Now,

$Magnification =\frac{-v}{u}$

∴ $Magnification =\frac{-30}{20}$

  $Magnification =-1.5$

Hence, the magnification = - 1.5