An image formed by a lens is erect. Such an image could be formed by a

Options

A. convex lens provided the image is smaller than object.
B. concave lens provided the image is smaller than object.
C. concave lens provided the image is larger than object
D. concave lens provided the image is of the same size

Explanation

To determine which type of lens can form an erect image, we need to analyze the properties of both convex and concave lenses.

### Step-by-Step Solution:

1. **Understanding Lens Types**:
- A **convex lens** converges light rays and can form both real and virtual images depending on the position of the object.
- A **concave lens** diverges light rays and always forms virtual images.

2. **Convex Lens Behavior**:
- A convex lens can produce an erect image only when the object is placed between the focal point (F) and the optical center (O) of the lens. In this case, the image formed is virtual, erect, and magnified.
- If the object is placed beyond the focal point, the image will be inverted.

3. **Concave Lens Behavior**:
- A concave lens always produces a virtual image that is erect and smaller than the object, regardless of the object's position. This is because the rays diverge, and when extended backward, they appear to come from a point behind the lens.

4. **Conclusion**:
- Since the question specifies that the image is erect, we can conclude that the image could be formed by a **concave lens**.

### Final Answer:
An image formed by a lens that is erect could be formed by a **concave lens**.

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