Define spherical aberration

1.	Define spherical aberration
Answer» OK I have asked some questions above try it.. You know ans..then please tell us.. This defect can be removed by using parabolic mirror The rays which are away from the principal axis converge before focus. This defect is called spherical aberration. Oh yes Give me right answer ?? ?? It is a case of optical effect which occurs due to increased reflection of light rays when they strike a lens. Is here someone.

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