Correct Option
The correct option isConvex lens
Explanation
In optics, lenses are classified based on how they refract parallel rays of light. A converging lens is one that bends parallel light rays inward so that they meet (converge) at a specific point called the principal focus. This behavior is determined by the shape of the lens and the refractive index of the material.
Option Analysis
- Concave lens Concave lens: Incorrect. A concave lens is thinner at the center than at the edges. When parallel rays pass through it, they are refracted outwards (away from the principal axis). Therefore, it is classified as a diverging lens.
- Convex mirror Convex mirror: Incorrect. A convex mirror is a reflective surface that bulges outward. It reflects parallel rays of light in such a way that they appear to diverge from a point behind the mirror. It is a diverging mirror.
- Convex lens Convex lens: Correct. A convex lens is thicker at the center than at the edges. As light rays pass through it, refraction causes them to bend towards the principal axis and meet at the focal point. Thus, it is classified as a converging lens.
- Plane mirror Plane mirror: Incorrect. A plane mirror has a flat reflective surface. It reflects parallel rays of light as parallel rays without causing them to converge or diverge.
Key Takeaway
Convex lenses are converging in nature because they focus light to a point, whereas concave lenses are diverging in nature because they spread light out.