Question

The focal length of a concave mirror is 15 cm . If
the object distance is 20 cm, find the position
& nature of the image​

Answer 1

Answer:

We can see Object distance (u) is 20cm.

Focal length (f)= 15 cm.

By using sign convention , in concave mirror,

u and f both -(ve).

There is a formula 1/u+1/v=1/f

Buy using this formula we can find the v.

v= 1/f - 1/u

v= -1/15 - 1/20

v= -60cm

So we can now say that the position of the image will be 60 cm from the mirror.

To identify the nature of the image, we have to use the formula of magnification (m)

m= hi/ho=-v/u

If it is +(ve) then image will be virtual and erect and vice versa.

m= -(-60)/-20

m= -3

So nature of the image is Real and Inverted.

 

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Explanation: