Geometrical OpticsHard
Question
A real image of a distance object is formed by a planconvex lens on its principal axis. Spherical aberration
Options
A.is absent
B.is smaller if the curved surface of the lense faces the object
C.is smaller if the plane surface of the lens faces the object
D.is the same whichever side of the lens faces the object
Solution
In general spherical aberration is minimum when the total deviation produced by the system is equally divided on all rfracting surfaces. A planoconvex lens has is used for this purposed. In order that the toatl deviation be equally divided on two surfaces, it is essential that more paallel beam (or the incident and rfracted) be incident on the convex side. Thus, when the object is far away from the lens, incident rays will be more parallel than the refracted rays, therefore, the object should be face the convex side, but if the object is near the lens, the object should face the plane side. this has been shown in figure.
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