X is an optical defect due to which a comet-like image is formed inste – McqOptions

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1.	X is an optical defect due to which a comet-like image is formed instead of a point image. X is ___________
A.	Coma
B.	Astigmatism
C.	Curvature
D.	Distortion
Answer» B. Astigmatism

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