- By
**keene** - Follow User

- 233 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Spherical lenses' - keene

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Thin, converging lenses: The rules

Section of a spherical surface with large radius of curvature R2

Section of a spherical surface with large radius of curvature R1

A) Any incoming ray parallel to the lens\'s axis always goes through the focal point on the other side!

B) Any ray coming in through the lens\'s focal point always goes out parallel to the lens’s axis.

Example: making a spotlight.

C) Any ray aimed at the lens\'s center always goes through un-deflected!

Thin, converging lenses: IMAGING

Our previous convention

Example: An 0.5 m tall object stands 1.75 m in front of a converging lens (focal length 0.75 m). Where’s the image, and how big?

Like the concave mirror, you get different behavior if the object is closer than f to the lens:

Virtual, upright image on same side as object

Like the concave mirror, you get different behavior if the object is closer than f to the lens:

Virtual, upright image on same side as object

Like the concave mirror, you get different behavior if the object is closer than f to the lens:

Virtual, upright image on same side as object

Like the concave mirror, you get different behavior if the object is closer than f to the lens:

Virtual, upright image on same side as object

Like the concave mirror, you get different behavior if the object is closer than f to the lens:

Virtual, upright image on same side as object

Example: An 0.05 m tall object stands .15 m in front of a converging lens (focal length 0.75 m). Where’s the image, and how big?

http://phet.colorado.edu/en/simulation/geometric-optics

A) A ray coming in parallel to the lens\'s axis always goes out at an angle as if it where coming from the focal point on the incident side!

B) A ray aimed at the lens\'s center always goes through un-deflected!

Image is upright

Virtual now

Fix it upto be the same formula as for the converging lens by making image and focal length negative!

Example: An 0.5 m tall object stands 1.75 m in front of a diverging lens (focal length -0.75 m). Where’s the image, and how big?

Download Presentation

Connecting to Server..