Which type of lens forms always a virtual image?
A concave lens will always give a virtual, erect, and diminished image, irrespective of the position of the object.
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, get spread out, or diverge, which results in forming a smaller image. Due to this effect, it is also known as a negative lens or a diverging lens.
The image formed by a concave lens is always diminished (very small), virtual and erect, which means it will appear to be farther away than it actually is, and therefore smaller than the object itself.
| S.No. | Ray Diagram | Position of Object | Position of Image | Nature of the Image |
| 1. | 
| At Infinity. | At F | Virtual, erect and highly diminished. |
| 2. | 
| Between Infinity and O. | Between F and O. | Virtual, ere |
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