Images Formed by Lenses

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.

Leave a Comment