Question

when an object is
placed in front of a concave
mirror of focal length 10 cm, its
enlarge
image is
is produced 30 cm away from object.
Find the
position of the object.​

Answer 1

Answer

Answer

Given,

Magnification, m=3

Object distance, u=10cm

We know,

Magnification, m=−

u

v

3=

−10

−v

⇒ v=30cm

From mirror formula,

f

1

=

v

1

+

u

1

f

1

=

30

1

−

10

1

=

30×10

10−30

=

300

−20

f=−15cm

Focal length, f=−15cm

I hope this is helpful for u

Answer 2

Answer:

Let magnification be m

So m= height of image/ height of object

So m= 3

Also m= -v/u (v is image distance and u is object distance

So 3 = -v/-10 ( u is negative 10 because it is always negative)

Thus v= 30

Now use the mirror formula i.e

1/f = 1/v + 1/u

And solve this

The answer is -15

Explanation:

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