Abigail Lee. Lenses refract light in such a way that an image of the light source is formed. With a converging lens, paraxial rays that are parallel to.

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Presentation transcript:

Abigail Lee

Lenses refract light in such a way that an image of the light source is formed. With a converging lens, paraxial rays that are parallel to the principal axis converge to the focal point.

With a diverging lens, paraxial rays that are parallel to the principal axis appear to originate from the focal point.

RAY DIAGRAMS

IMAGE FORMATION BY A CONVERGING LENS In this example, when the object is placed further than twice the focal length from the lens(which is C, the center), the real image is inverted and smaller than the object.

When the object is placed between F and 2F(C), the real image is inverted and larger than the object.

When the object is placed between F and the lens, the virtual image is upright and larger than the object.

IMAGE FORMATION BY A DIVERGING LENS A diverging lens always forms an upright, virtual, diminished image.

Summary of Sign Conventions for Lenses

The image produced by one lens serves as the object for the next lens.

Example Question A 1.70-m tall person is standing 2.50 m in front of a camera. The camera uses a converging lens whose focal length is m. (a)Find the image distance and determine whether the image is real or virtual. real image

(b) Find the magnification and height of the image on the film.