Image formation in a convex lens can be explained with the help of three principal rays shown in the figure. Here, Object AB is at 2F 1. Real Image: A convex lens can be used to produce a real image, and this occurs if the object is located at a position of more than one focal length from the lens. In this case no image will formed because the refracted rays are parallel and never meet. On the contrary, the image formed by the concave lens is erect, virtual and smaller, than the object. The size of the image is much smaller than that of the object. This is explained with the help of ray diagrams as follows: Image formation in a convex lens can be explained with the help of three principal rays shown in the figure. So, lenses formed by binding two spherical surfaces bulging outward are known as convex lenses while the lenses formed by binding two spherical surfaces such that they are curved inward are known as concave lenses. Convex lens point object at infinity, image at focus. Fig. When an object is placed behind the center of curvature, the real image is formed between the center of curvature and focus. The ray passing through optical centre passes straight through the lens and remains undeviated. Lenses are used for the correction of issues related to vision. Image formed by a convex lens when the object is placed at infinity When the object is placed at infinity, the two rays AO and BD running parallel to the principal axis get refracted at point O and D respectively and intersect each other at the principal focus. When an object is placed at the focus, a real image is formed at infinity. Image formation by concave lens ray diagrams, Image formation by convex lens ray diagrams, Reflection of Light Examples in daily life, Polarization of light:definition,types,uses and examples, difference between fresnel and fraunhofer diffraction in tabular form. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. The ray parallel to the principal axis passes through the focal point after. Virtual Image: A convex lens will produce a virtual image if the object is located in front of the focal point. Your email address will not be published. In mirrors, images are formed through reflection but lenses form images through refraction. The ray parallel to the principal axis passes through the focal point after refraction by the lens. The size of the image is the same as compared to that of the object. In this case image will form between F and 2F, image will be real, inverted, smaller than the object. While the real and inverted image is formed from a convex lens. Uses of the Convex Lens: There are following uses: It is used as Hypermetropedia i.e. When an object is placed at infinity, a virtual image is formed at the focus. This is one of the basic difference between concave and convex lenses. Required fields are marked *. When a ray, passing through focus strikes concave or convex lenses, the reflected ray will pass parallel to the principal axis. What are some examples of refraction of light? Why diffraction grating have closely spaced rulings? Stay tuned with BYJU’S to learn more about image formation by concave and convex lenses and explore more on physics formulas and calculators. We saw that, image formed by convex lens isPosition of the objectPosition of the imageRelative size of the imageNature of the imageAt infinityAt focus F2Highly diminished, point-sizedReal and invertedBeyond 2F1Between F2and 2F2DiminishedReal and invertedAt 2F1At 2F2Same SizeReal and invertedBetween The ray passing through optical centre passes straight through the lens … How to find Vernier caliper least count formula? When an object is placed in between focus and pole, a virtual image is formed. The size of the image is much smaller than that of the object. In this article, we will learn about image formation by concave and convex lenses. As the center of the convex lens is thicker, it makes the object image at the focus point look larger and closer. Case 5:When object is placed between F and optical center In this case image will form behind the object, also image will be virtual, erect, larger than the object. What is Difference Between Heat and Temperature? The image is formed at focus F 2.It is real and point sized. It is used to the movie theater, projector etc. When a ray, parallel to the principal axis strikes concave or convex lenses, the reflected ray passes through a focus on the principal axis. When an object is placed in between the center of curvature and focus, the real image is formed behind the center of curvature. Image formation by convex and concave lens ray diagrams. The size of the image is larger than that of the object. Due to the thicker centre of convex lenses, the objects are seen larger and closer. Convex Lenses When an object is placed at infinity, the real image is formed at the focus. It is used in microscopes, telescopes and magnifying glasses to subject all the light to a specific object. Spherical lenses are the lenses formed by bounding two spherical transparent surfaces together. 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