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A mirror used as a telescope objective is free from aberration that is:
AAngular
BLateral
CChromatic
DSpherical
Answer & Solution
Correct answer: C. Chromatic
1. A lens splits colours because its index varies.
2. A mirror reflects all colours alike.
3. So there is no chromatic aberration in a mirror.
_Source: NCERT Class 12 Physics Part II, Chapter 9, Ray Optics and Optical Instruments._
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