"LENS COMBINATIONS, THICK LENSES, GAUSSIAN FORMULA. Definitions of variables follow: FOCAL_L? = effective focal length of thick lens #?, ?=1 or 2 H?1, H?2 = locations of first and second principal planes of lens #?, ?=1 or 2 FFL1, BFL2 = front focal length of lens #1, back focal length of lens #2 H??_H? = distance from princ. plane of lens #? to system princ. plane. FOCAL_LENGTH = system focal length measured from system princ. planes S[I], S[O] = image and object distances of system M[T] = transverse magnitization of system D = distance from lens #1 second princ. plane to lens #2 first princ. plane D? = distances between princ. planes of each thick lens N[L?] = index of lense #?, N[M] = index of medium (air = 1) R?1, R?2 = radii of curvature of lens #?, ?=1 or 2 Note: distances to right are considered +. (c) Copyright PCSCC, Inc., 1993 *** Answer(s) to problem *** Note: variables are set to proper values at entry. The ant is (90+57.7)mm in front of lens #1 and its image is (40.9+115.4)mm behind lens #2. Note, thin lenses are assumed, D1=D2=0 and H11=H12=0 H21=H22=0. Type any key to exit. || A bi-concave lens (radius=-50 mm, index=1.6) is positioned 150 mm up a plastic tube in front of a plano-convex lens (radius 50 mm, index 1.6). Calculate the image location of a 9 mm carpenter ant 90 mm in front of thedevice. Type comma key to see answer. Type (F2) to return to application file."
