Images Formed by Lenses
Images formed by Convex Lens
Position of object | Position of image | Nature of image |
At infinity | At focus | Real, diminished, inverted |
At 2F | At 2F | Real, diminished and inverted |
Between 2F and F | Beyond 2F | Real, enlarged, inverted |
At F | No image | Refracted rays are parallel |
Between F and lens | On the same side as the object | Virtual, enlarged and upright |
Uses of Convex Lens· Used in magnifying glass. · Used to correct the vision of long-sighted persons. |
Images formed by Concave Lens
Position of object | Position of image | Nature of image |
At infinity | At focus | Virtual, diminished, upright |
Between infinity and F | Between the object and the lens | Virtual, diminished, upright |
Uses of Concave Lens· Used in spy holes on doors to check the visitors. · Used to correct the vision of short-sighted persons. |
Real Images· Real Image is an image which can be projected onto a screen. · Real images are always located in front of the mirror and behind the lens. · Real images are always inverted and never upright. · Concave lenses, Convex mirrors and plane mirrors always form virtual images and can never form real images. |
Virtual Images· Virtual Image is an image which cannot be projected onto a screen. · Virtual images are always located in behind the mirror and in front of the lens. · Virtual images are always upright and never inverted. |