Answers

2014-11-30T14:59:10+05:30
Pherical aberration is an optical effect observed in an optical device (lensmirror, etc.) that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike nearer the centre. It signifies a deviation of the device from the norm, i.e., it results in an imperfection of the produced image.
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2014-11-30T15:04:17+05:30
It is an optical effect  observed in an optical device that occurs due to increased
refraction of light rays when they strike  a lens or a reflection of light rays when they strike a mirror near its edges in comparison with those that strike  near the centre
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