# OP MT2

 The flashcards below were created by user Alicat38 on FreezingBlue Flashcards. Curvature of surface the angle turned through per unit length of arcR = 1/r in Dioptre (D) Refraction Light passes through an interface b/t 2 optical media Reflection Light bounces at interface Image New wavefront curvature (vergence in air) L' gives distance to image More curvature -> more vergence changing power Lens gauge/clock/measure measures surface power by measuring the sag of a lens of a specific refrative index Centered or symmetrcal elements elements positioned such that they have a common axis Surface power Measure of the ability of the surface to change the vergence of lightFs = (n'-n)/r = n'/f' = -n/fin Dioptre 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) Lens has two refracting surfaces (both surfaces spherical or one surface may be plano (plane, no curvature, zero power)) Center thickness Thickness at the vertex of the lens Thin lens negligible centre thickness, change in vergence as light passes through the lens is insignificant Biconvex/concave both surfaces are have the same sign but different powers Equiconvex/concave both surfaces have the same power Meniscus center of curvature is on the same side of lens for both surfaces planoconvex/concave zero power on one side, all power on other side Lens form (bending) any power of lens can be obtained by a combination of surface powers Principal foci Light from infinity (parallel) passes lens and focuses at the SECOND prinicipal focusLight emerging from FIRST principal focus emerges from the lens parallel Symmetric planes closest possible distance b/t a real object and its real image in a plus lensORclosest possible distance b/t a virtual object and its virtual image in a minus lens Principal plane location of object and image when m=+1 AuthorAlicat38 ID116527 Card SetOP MT2 DescriptionOp Updated2011-11-15T03:48:55Z Show Answers