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Convex lenses are also known as converging lenses since the rays converge after falling on the convex lens. The concave lens are known as diverging lenses, as the rays diverge after falling on the concave lens. In this article, we will learn about image formation by concave and convex lenses.
A convex lens or converging lens focuses the light rays to a specific point, whereas a concave lens or diverging lens diverges the light rays. A lens is a transparent material (either curved or flat surface) based on the principles of refraction. Concave lenses and convex lenses are often used together which is known as the Concave – Convex lens.
(a) Explain with the help of a diagram, why the convex lens is also called a converging lens. (b ) Define principal axis, principal focus and focal length of a convex lens. View Solution
Definition of Convex Lens. This type of lens is thicker at the centre and thinner at the edges. An optical lens is generally made up of two spherical surfaces. If those surfaces are bent outwards, the lens is called a biconvex lens or simply a convex lens. These types of lenses can converge a beam of light coming from outside and focus it to a ...
A converging lens is used to produce an image of an object on a screen,object on a screen. What change is needed for the image to be formed nearer to the lens? (a) increase the focal length of the lens (b) insert a diverging lens between the lens and the screen (c) increase the distance of the object from the lens (d) move the object closer to ...
Convex Lens (Converging) Concave Lens (Diverging) Convex lenses are thick in the middle and thinner at the edges. A concave lens is flat in the middle and thicker at the edges. A convex lens is also known as the converging lens as the light rays bend inwards and converge at a point which is known as focal length.
In a biconvex lens or a Plano-convex lens, a collimated or accurately parallel beam of light passes through the lens and converges at a spot or focus coming behind the lens. In such a case, this lens is known as a converging or positive lens. The distance coming from the lens up to the spot is called the focal length of the lens.
A convex lens is a converging lens. Therefore when parallel light rays pass through the lens, the refracted rays converge at one point, called the principal focus. The angle at which the rays of light enter the convex lens depends on the distance of the object from the lens. The image formed by a convex lens is real.
This lens formula is applicable to both the concave and convex lenses. If the equation shows a negative image distance, then the image is a virtual image on the same side of the lens as the object. If this equation shows a negative focal length, then the lens is a diverging lens rather than the converging lens.
In addition, we also call a convex lens a converging lens as it converges a parallel beam of light on a point which we call the principal focus. Types of Convex Lens. There are basically three types of these lenses, they are the plano-convex lens, the double convex lens, and finally, concave-convex lens. We will now look at them in detail.
