#### A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is: Option 1) 15 cm Option 2) 2.5 cm Option 3) 5 cm Option 4) 10 cm

As we discussed in

Consider point A:

From mirror formula

Hence image will form at A itself.

For B

size of image =

= 5 cm.

Option 1)

15 cm

This option is incorrect.

Option 2)

2.5 cm

This option is incorrect.

Option 3)

5 cm

This option is correct.

Option 4)

10 cm

This option is incorrect.