of least contusion! 83 Two thin cylindrical lenses, one of power +5 D cylinder axis vertical and the other +4D cylinder axis horizontal and 45 mm diameter, are placed in contact 0.5 m from a point source of light. Find the dimensions of the patch of light on a screen parallel to the plane of the lenses and (a) 0.2 m; (b) 0.4 m; (c) 0.6 m from the lenses. 8.4 A sphero-cylindrical lens has powers +5.0 D spherical/-2.0 D cylindrical, axis vertical. It is required to make a lens equivalent to this with one surface plane; what powers must be worked on the other surface? What type of surface is this? Give a diagram. -r -1— ,-,f re.frantive index 1.523 has a tonic surface the Dowers of which
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