Under what circumstances secondary evidence is admissible in evidence?

Secondary evidence is admissible in circumstances provided for under section 67 of the Law of Evidence Act, 1967 and these are: 

*When original document appears to be in possession of power of a person when the document is sought to be adduced against; 

*When existence, condition or contents of original document are admitted in writing by person against whom it is proved or by his representative in interest; 

*When original document has been destroyed or lost or when or when it cannot be produced in reasonable time; when original document is of such a nature as not to be easily movable; 

*When the original is public document within the meaning of section 83 of the Law of Evidence Act. 

*When the original document is of which certified copy is permitted by The Law of Evidence Act or any written law to be produced in evidence; and 

*When original when original consist of numerous accounts or other documents that cannot be conveniently examined in Court, and fact to be proved is the general results of whole collection.