Nothing is an offence which is done by any person who is justified by law, or who by reason of a mistake of fact and not by reason of a mistake of law in good faith, believes himself to be justified by law, in doing it"
Illustration
A sees Z commit what appears to A to be a murder" A, in the exercise, to the
best of his judgment exerted in good faith, of the power which the law gives to
all persons of apprehending murderers in the fact, seizes Z, in order to bring Z
before the proper authorities" A has committed no offence, though it may turn
out that Z was acting in self-defence"
71 IPC Limit of punishment of offence made up of several offences
74 IPC Limit of solitary confinement
76 IPC Act done by a person bound, or by mistake of fact believing himself bound, by law
77 IPC Act of Judge when acting judicially
78 IPC Act done pursuant to the judgment or order of Court
79 IPC Act done by a person justified, or by mistake of fact believing himself, justified, by law