"THIN LENS IMAGERY, FIND F from R1, R2, BI-CONVEX, GAUSSIAN. A summary of object/image properties for concave and convex lenses follows. (enter 2 of 3 values and leave unknown as 0, program will calculate.) Lens OBJECT <-------------------- IMAGE -------------------> Location Type Location Orient. rel. size CNCV anywhere virtual |S[I]<|F| erect minfied CNVX ∞>S[O]>2*F real F<S[I]<2*F invert. minified CNVX S[O]=2*F real S[I]=2*F invert. same size CNVX F<S[O]<2*F real ∞>S[I]>2*f invert. magnified CNVX S[O]=F ±∞ CNVX S[O]<F virtual |S[I]|>S[O] erect magnified F = focal length Transverse magnification: M[T] < 0 inverted |M[T]| < 1 minified *** Answer(s) to problem *** (c) PCSCC, Inc., 1993 (a) Set N[G]=1.6, N[M]=1, R1=20 and R2=-70. Note for bi-convex, one R is + and other is -. (b) Move cursor to S[I]]. Set S[I]=1. Type S then (end esc) M[T] (enter) then (end esc) -0.5 (enter). Use default range, type (enter). S[I]=38.9 and S[O]=77.8. ||A thin bi-convex glass (N[g]=1.6) with radii of 20 and 70 cm casts a half-sized image of a plant pot on a white wall. (a) What is its focal length? (b) What are the lens to plant and lens to wall distances? Type comma key to see answer. Type (F2) to return to application file."
