Question

Which lens always forms diminished and erect image?

Answer 1

Image of an object

1. The image of an object forms at a point of intersection of light rays refracted from the lens or reflected from a mirror.
2. Erect images are up-right images whereas inverted images are upside-down images as compared with the object placed in front of the lens.

Magnification of an image

1. Comparing the size of an object with the size of its image is termed as magnification. This is expressed as the ratio of the size of an image to the size of the object.
2. If the size of an image is greater than that of the object then the image is called an enlarged image.
3. If the size of an image is smaller than that of the object then the image is called a diminished image.
4. A concave lens always produces a diminished, virtual and erect image. The convex lens produces an erect and enlarged image only when the object is between focus and optical center else the image is inverted of varying magnification.

Hence, a convex lens always forms a diminished and erect image except for the case when the object is placed between the focus and the optical center of the lens.