Concave Lens Always Forms Virtual, Erect, Diminished Image
A concave lens is a diverging lens. Its primary characteristic is that it spreads out light rays that pass through it.
- When light rays from an object pass through a concave lens, they diverge.
- To form an image, these diverging rays are traced back. They appear to originate from a point on the same side of the lens as the object.
- This point of origin forms the image, which is always virtual (cannot be projected onto a screen) because the rays do not actually converge there.
- Furthermore, irrespective of the object's position (whether at infinity or between the optical center and infinity), the image formed by a concave lens is consistently erect (upright, same orientation as the object) and diminished (smaller than the object).
Image Characteristics Analysis
Let's analyze the options based on these properties:
- Option 1: Real, inverted, and enlarged - Incorrect. Concave lenses form virtual images, not real ones.
- Option 2: Virtual, erect, and diminished - Correct. This accurately describes the image formed by a concave lens for any object position.
- Option 3: Real, erect, and same size - Incorrect. Concave lenses form virtual images and typically diminished ones, not real images of the same size.
- Option 4: Virtual, inverted, and enlarged - Incorrect. While the image is virtual, it is always erect, not inverted.
Therefore, a concave lens always forms a virtual, erect, and diminished image.
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