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Updated on 19th October, 2023 , 3 min read
A concave mirror has a reflective surface that curves inward and away from the light source. Light is directed inward by concave mirrors to a single focal point. Contrary to convex mirrors, a concave mirror's image is dependent on the separation between the object and the mirror.
A concave lens diverts a straight light beam from the source, resulting in a diminished, upright virtual image.
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Image formation with a concave lens can be demonstrated by:
The position of the object placed | The position of the image formed | The nature of the image formed | The relative size of the image formed |
At infinity | At the first focus, F1 | Virtual and erect image | Highly diminished, point-sized image |
Between infinity and the optical center O | Between the first focus, F1, and the optical center O | Virtual and erect image | Diminished image |
In this case,
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A concave lens causes light rays to diverge in parallel and spread out so that they appear to come from a point behind the lens that is the focal point. The focal length of a lens is defined as the distance between the center of the lens and a focal point.
A concave lens produces a vertically inward, real or virtual, and always diminished image.
The diverging lens is another name for a concave lens.
A virtual image is always formed by a concave lens.
A virtual image is formed between the optical center and the focus of the convex lens when an object is placed at a finite distance from the lens. The image’s size is smaller than the object’s.
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