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If the image formed by a lens is always diminished and erect, what is the nature of the lens?
If the image formed by a lens is always diminished and erect, then the nature of the lens is concave.
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 always virtual, erect, and diminished.
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