Question

where should a small object be placed on the axis of a concave mirror of focal length 30cm in order to from an inverted image of same size as the object​

Answer 1

Answer:yh

Step-by-step explanation:

Answer 2

Given

Object is placed in front of a concave mirror which has focal length of 30 cm.

To find

Position of object which produces an inverted image of the same size.

Solution

In the case of a concave mirror the if an object is placed at the focus the image is produced at infinity. As you get closer to the mirror from the focus the image is larger in size, erect, virtual and forms on the other side of the mirror. As the object moves towards the radius of curvature from the focus the image starts getting smaller which is inverted and real. At the radius of curvature the image and object are of the same size. The image is real and inverted.

So, the object has to be placed at the radius of curvature of the lens which is two times the focal length i.e., $2\times 30=60\ \text{cm}$ from the lens.