Which law would be applicable when notice period for resignation is not provided in offer letter

When notice period not provided in offer which law is applicable under resignation law in India?

Leaving aside legality part by virtue of role and responsibility one has to follow proper exit process and ensure smooth separation from the employer. At times going by the verdict of law will not help you. If you leave your employer abruptly quoting nil notice period, tomorrow employer will take chance to give back adversely in case of background verification or during reference check.

If the company does not mentioned what is the notice period employee should serve, then which law will apply ?
if the Employee serve the notice Period of 2 months after his resignation mail, as per stranded is ok
or
any rule exist that state the employee should complete certain period of time if the employer is provided the notice period in the offer letter and employee as not signed any document.
kindly explain....

If there is no separation clause (notice period) in your appointment terms you can discuss with your employer and establish your relieving date which may be immediate after submitting resignation. However get the concurrence of the employer for smooth exit process.