Spherical lenses
Download
1 / 51

Spherical lenses - PowerPoint PPT Presentation


  • 229 Views
  • Uploaded on

Spherical lenses. Spherical lenses. Spherical lenses. Thin , converging lenses: The rules. Section of a spherical surface with large radius of curvature R 2. Section of a spherical surface with large radius of curvature R 1. Thin, converging lenses. Thin, converging lenses.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
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




Thin, converging lenses

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


Thin, converging lenses

Example: light a fire.

DEMO?



Thin, converging lenses

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


Thin, converging lenses

Example: making a spotlight.



Thin, converging lenses

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


Thin, object is closer than converging lens


Example: object is closer than 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?


SIM object is closer than

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


A Simple Camera: fixed focal length object is closer than

Shutter

exposure

film

Aperture:

Exposure

Depth of field




A Real Camera object is closer than


Thin, object is closer than diverging lenses


Thin, object is closer than diverging lenses


Thin, object is closer than diverging lenses

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!


Thin, object is closer than diverging lenses


Thin, object is closer than diverging lenses

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


Thin, diverging lenses: IMAGING object is closer than


Thin, diverging lenses: IMAGING object is closer than


Thin, diverging lenses: IMAGING object is closer than


Thin, diverging lenses: IMAGING object is closer than


Thin, diverging lenses: IMAGING object is closer than


Thin, diverging lenses: IMAGING object is closer than


Image on same side as object object is closer than

Image is upright

Virtual now

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


Thin, object is closer than diverging lenses: IMAGING


Example: object is closer than 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?


THIN LENS EQUATIONS: object is closer than

converging

diverging

Backwards from convention for mirrors


Example: Compare object is closer than virtual images from converging and diverging lenses

2 m

O

O

I

I

5 m

2 m

5 m


ad