In a ………………………………. lens the image formed is always virtual and erect.

Explanation

### Step-by-Step Solution:

1. **Understanding Lens Types**:
- Lenses can be classified into two main types: convex (converging) lenses and concave (diverging) lenses.

2. **Image Formation**:
- A convex lens can produce both real and virtual images depending on the position of the object. When the object is placed beyond the focal point, a real image is formed. However, when the object is placed within the focal length, a virtual and erect image is formed.
- In contrast, a concave lens always produces virtual images regardless of the object's position.
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