By means of plotting find:
(a) The path of a ray of light beyond thin converging and diverging lenses (Fig. 5.7, where 00' is the optical axis, F and F' are the front and rear focal points);
(b) The position of a thin lens and its focal points if the position of the optical axis 00' and the positions of the cojugate points P, P' (see Fig. 5.5) are known; the media on both sides of the lenses are identical;
(c) The path of ray 2 beyond the converging and diverging lenses (Fig. 5.8) if the path of ray 1 and the .positions of the lens and of its optical axis 00' are all known; the media on both sides of the lenses are identical.

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Part A .0- 0. (b) (a) Part B 0- (6) (a)