# OP MT2

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The flashcards below were created by user Alicat38 on FreezingBlue Flashcards.

1. Curvature of surface
• the angle turned through per unit length of arc
• R = 1/r in Dioptre (D)
2. Refraction
Light passes through an interface b/t 2 optical media
3. Reflection
Light bounces at interface
4. Image
New wavefront curvature (vergence in air) L' gives distance to image
5. More curvature ->
more vergence changing power
6. Lens gauge/clock/measure
measures surface power by measuring the sag of a lens of a specific refrative index
7. Centered or symmetrcal elements
elements positioned such that they have a common axis
8. Surface power
• Measure of the ability of the surface to change the vergence of light
• Fs = (n'-n)/r = n'/f' = -n/f
• in Dioptre
9. Chief ray of extended object through a spherical surface
ray passes through the center of curvature (it is undeviated because it is normal to the spherical surface)
10. Lens
has two refracting surfaces (both surfaces spherical or one surface may be plano (plane, no curvature, zero power))
11. Center thickness
Thickness at the vertex of the lens
12. Thin lens
negligible centre thickness, change in vergence as light passes through the lens is insignificant
13. Biconvex/concave
both surfaces are have the same sign but different powers
14. Equiconvex/concave
both surfaces have the same power
15. Meniscus
center of curvature is on the same side of lens for both surfaces
16. planoconvex/concave
zero power on one side, all power on other side
17. Lens form (bending)
any power of lens can be obtained by a combination of surface powers
18. Principal foci
• Light from infinity (parallel) passes lens and focuses at the SECOND prinicipal focus
• Light emerging from FIRST principal focus emerges from the lens parallel
19. Symmetric planes
• closest possible distance b/t a real object and its real image in a plus lens
• OR
• closest possible distance b/t a virtual object and its virtual image in a minus lens
20. Principal plane
location of object and image when m=+1

### Card Set Information

 Author: Alicat38 ID: 116527 Filename: OP MT2 Updated: 2011-11-15 03:48:55 Tags: definitions Folders: Description: Op Show Answers:

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