Download presentation

Presentation is loading. Please wait.

1
**Hecht 5.2, 6.1 Monday September 16, 2002**

Curved mirrors, thin & thick lenses and cardinal points in paraxial optics Hecht 5.2, 6.1 Monday September 16, 2002

2
**General comments Welcome comments on structure of the course.**

Drop by in person Slip an anonymous note under my door …

3
**Reflection at a curved mirror interface in paraxial approx.**

y φ ’ O C I s’ s

4
**Sign convention: Mirrors**

Object distance S >0 for real object (to the left of V) S<0 for virtual object Image distance S’ > 0 for real image (to left of V) S’ < 0 for virtual image (to right of V) Radius R > 0 (C to the right of V) R < 0 (C to the left of V)

5
**Paraxial ray equation for reflection by curved mirrors**

In previous example, So we can write more generally,

6
**Ray diagrams: concave mirrors**

Erect Virtual Enlarged C ƒ e.g. shaving mirror What if s > f ? s s’

7
**Ray diagrams: convex mirrors**

Calculate s’ for R=10 cm, s = 20 cm Erect Virtual Reduced ƒ C What if s < |f| ? s s’

8
Thin lens First interface Second interface

9
**Bi-convex thin lens: Ray diagram**

Erect Virtual Enlarged O f f ‘ n n’ R1 R2 s s’

10
**Bi-convex thin lens: Ray diagram**

Inverted Real Enlarged O I f f ‘ n n’ s s’

11
**Bi-concave thin lens: Ray diagram**

f f ‘ n’ n R1 R2 s’ s Erect Virtual Reduced

12
**Converging and diverging lenses**

Why are the following lenses converging or diverging? Converging lenses Diverging lenses

13
**Newtonian equation for thin lens**

x I f f ‘ x’ n n’ s s’

14
**Complex optical systems**

Thick lenses, combinations of lenses etc.. Consider case where t is not negligible. We would like to maintain our Gaussian imaging relation n n’ t nL But where do we measure s, s’ ; f, f’ from? How do we determine P? We try to develop a formalism that can be used with any system!!

15
**Cardinal points and planes: 1**

Cardinal points and planes: 1. Focal (F) points & Principal planes (PP) and points n nL n’ F2 H2 ƒ’ PP2 Keep definition of focal point ƒ’

16
**Cardinal points and planes: 1**

Cardinal points and planes: 1. Focal (F) points & Principal planes (PP) and points n nL n’ F1 H1 ƒ PP1 Keep definition of focal point ƒ

17
**Utility of principal planes**

Suppose s, s’, f, f’ all measured from H1 and H2 … n nL n’ h F1 F2 H1 H2 h’ ƒ’ ƒ s s’ PP1 PP2 Show that we recover the Gaussian Imaging relation…

18
**Cardinal points and planes: 1. Nodal (N) points and planes**

nL NP1 NP2

19
**Cardinal planes of simple systems 1. Thin lens**

V’ and V coincide and V’ V H, H’ is obeyed. Principal planes, nodal planes, coincide at center

20
**Cardinal planes of simple systems 1. Spherical refracting surface**

Gaussian imaging formula obeyed, with all distances measured from V V

21
**Conjugate Planes – where y’=y**

nL n’ y F1 F2 H1 H2 y’ ƒ’ ƒ s s’ PP1 PP2

22
**Combination of two systems: e. g**

Combination of two systems: e.g. two spherical interfaces, two thin lenses … n H1 H1’ n2 H’ h’ n’ H2 H2’ 1. Consider F’ and F1’ Find h’ y Y F’ F1’ d ƒ’ ƒ1’

23
**Combination of two systems:**

H2 H2’ h H Find h H1’ H1 y Y F2 F ƒ d ƒ2 1. Consider F and F2 n n2 n’

24
Summary H H’ H1 H1’ H2 H2’ F F’ d h h’ ƒ ƒ’

25
Summary

Similar presentations

Presentation is loading. Please wait....

OK

Cardinal planes and matrix methods

Cardinal planes and matrix methods

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on nature and human relationship Ppt on dressing etiquettes Ppt online downloader youtube Games we play ppt on ipad Ppt on case study of cyber crime Ppt on solar power energy Ppt on printers and plotters Ppt on energy resources in india Ppt on magneto optical current transformer Ppt on stop and wait protocol