Give the position, size and nature of image formed by a concave lens when the object is placed:(a) anywhere between optical centre and infinity.(b) at infinity.
(a) In the case of a concave lens, when an object is placed anywhere between the optical centre $(C)$ and infinity, then the position of the image is between the optical centre and the focus, nature of the image is virtual and erect and size is diminished.
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(b) In the case of a concave lens, when an object is placed at infinity, then the position of the image is at the focus $(F)$, nature of the image is virtual and erect and size is highly diminished.
Image is posted for reference only
Explanation
Diverging Lens or Concave Lens $-$ It is a lens that possesses at least one surface that curves inwards in the middle. In other words, it is thin across the middle and thick at the upper and lower edges, because of which the light that enters the lens, gets spread out, or diverges, which results in forming a smaller image. Due to this effect, it is also called a negative lens or a diverging lens.
The image formed by a concave lens is virtual & erect, which means it will appear to be farther away than it actually is, and therefore smaller than the object itself.
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