An object is brought towards a concave mirror. How does the position and size of the image change ?
When the object is far from the concave mirror, the image is at the focus and is a diminished, inverted image. As the object is brought towards the mirror, the image shifts away from it and its size increases. When the object is at the centre of curvature of the mirror, the image is also at the centre of curvature and is of size equal to the object's size. By further bringing the object towards the mirror, the image gets magnified and moves away from the centre of curvature. The image is at infinity when the object is in the mirror's focus. Suppose the object is further moved towards the mirror. In that case, the image becomes erect and magnified and is formed behind the mirror.
The focal length of a concave mirror is 12 cm. Find the position and nature of the image formed by graphical construction when an object is placed at a distance of 6 cm from the mirror?
Find the image's size, nature and position formed when an object of size 1 cm is placed at a distance of 25 cm from a concave mirror of a focal length of 20 cm?