Image Formation by Lens (3)

Definition of focal point, F for concave lens

The focal point, F is a point on the principal axis, where light rays parallel to the principal axis converge after passing through the lens

Definition of focal point, F for cancave lens

The focal point, F is a point on the principal axis, where light rays parallel to the principal axis appear to diverge from it after passing through the lens

Definition of focal length, ƒ

The distance between the focal point, F and the optical centre

Definition of object distance, u

The distance between the object and the optical centre

Definition of image distance, ν

The distance between the image and the optical centre

Method for drawing ray diagrams for convex lens (1)

A light ray parallel to the principal axis refracts and passes through the focal point, F

Method for drawing ray diagrams for convex lens (2)

A light ray heading towards the optical centre continues in a straight line through the optical centre without refracting

Method for drawing ray diagrams for concave lens (1)

A light ray parallel to the principal axis refracts and appears to come from the focal point, F

Method for drawing ray diagrams for concave lens (2)

A light ray heading towards the optical centre continues in a straight line through the optical centre without refracting

Characteristics of images formed by a convex lens where object is further than 2F and image is between F and 2F

- Real - Inverted - Diminished

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Image Formation by Lens (3)

Image Formation by Lens (3)