Answer:
The distance of the image produced by the concave mirror is 11.27 cm.
Step-by-step explanation:
Given that,
Focal length = 8.40 cm
Distance between object and plane mirror = 11.0 cm
Distance between plane mirror and concave mirror = 22.0 cm
We need to calculate the object distance

We need to calculate the distance of the image
Using formula of distance of the image

Where, u = Object distance
f = focal length
Put the value into the formula


Hence, The distance of the image produced by the concave mirror is 11.27 cm.