SECTION 73 IPC - Indian Penal Code - Solitary confinement

Whenever any person is convicted of an offence for which under this Code the Court has power to sentence him to rigorous imprisonment, the Court may, by its sentence, order that the offender shall be kept in solitary confinement for any portion or portions of the imprisonment to which he is sentenced, not exceeding three months in the whole, according to the following scale, that is to say:
a time not exceeding one month if the term of imprisonment shall not exceed six months;
a time not exceeding two months if the term of imprisonment shall exceed six months and shall not exceed one year;
a time not exceeding three months if the term of imprisonment shall exceed one year.

IPC 73 in Simple Words

In simple words, if a person is convicted of an offense punishable with rigorous imprisonment, the court can order solitary confinement for up to one month if the total imprisonment is up to six months, up to two months if the imprisonment is more than six months but less than one year, and up to three months if the imprisonment is for more than one year.