1.The lens which is thicker in middle,that at the edges is called a convex lens.


2.The lens which is thinner in the middle that at the edges is called a concave lens.

Differences between convex lens and convex mirror

Convex lens and convex mirror are both optical devices that have curved surfaces. While they share some similarities, they also have distinct characteristics that set them apart. Let's explore the differences between these two optical devices in detail.

1. Shape and Curvature:
- Convex Lens: A convex lens is thick at the center and thin at the edges. It has two curved surfaces, one on each side, with a bulging middle and tapering edges.
- Convex Mirror: On the other hand, a convex mirror is curved outward throughout its surface. It has a reflective surface that bulges outwards, forming a rounded shape.

2. Focusing Properties:
- Convex Lens: A convex lens is a converging lens, meaning it brings parallel rays of light together to a focal point. It has two focal points on either side of the lens, and the distance between the lens and the focal point is called the focal length.
- Convex Mirror: In contrast, a convex mirror is a diverging mirror. It diverges parallel rays of light, making them appear to come from a virtual focal point behind the mirror. The focal point of a convex mirror is virtual and cannot be physically reached.

3. Image Formation:
- Convex Lens: When an object is placed in front of a convex lens, it can form different types of images depending on the object's position relative to the lens. It can form both real and virtual images, which can be magnified or reduced in size.
- Convex Mirror: A convex mirror always forms a virtual, diminished, and upright image regardless of the object's position. The image formed by a convex mirror is smaller than the actual object and is located behind the mirror.

4. Field of View:
- Convex Lens: A convex lens has a limited field of view. It can focus light from a narrow range of angles and is commonly used in applications such as cameras, glasses, and telescopes.
- Convex Mirror: On the contrary, a convex mirror has a wide field of view. It reflects light over a larger area, allowing for a broader range of vision. Convex mirrors are commonly used as side-view mirrors in vehicles to provide a wider view of the surroundings.

5. Applications:
- Convex Lens: Convex lenses have various applications, including photography, corrective lenses for vision problems (farsightedness and presbyopia), magnifying glasses, projectors, microscopes, and telescopes.
- Convex Mirror: Convex mirrors are widely used as safety mirrors in parking lots, supermarkets, and road intersections. They provide a wide-angle view, allowing people to see around corners and detect potential hazards.

In conclusion, convex lenses and convex mirrors differ in terms of their shape, focusing properties, image formation, field of view, and applications. While convex lenses converge light and can form both real and virtual images, convex mirrors diverge light and always form virtual images. Understanding these differences is crucial in determining the appropriate use of these optical devices in various applications.