An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm.(a) Draw a ray diagram for the formation of image.(b) Calculate the image distance.(c) State two characteristics of the image formed.

(a) Ray Diagram-

(b) Given:

Distance of the object from the mirror $u$ = $-$10 cm

Focal length of the mirror, $f$ = $-$20 cm

To find: Distance of the image $v$.


From the mirror formula, we know that-


Substituting the given values in the mirror formula we get-







Thus, the distance of the image $v$ is 20cm, and the positive sign implies that the image forms behind the mirror (on the right).

(c) The two characteristics of the image formed are as follows:

1. It is virtual and erect.

2. It is magnified (enlarged).


Simply Easy Learning

Updated on: 10-Oct-2022


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