There is no documented usage of an LPVO scope on an SLR with either the Indian Army or CRPF.
The Indian Army has been known to use old BEL NVG scopes on the SLR for use as an SDMR.
Some police STFs, very sparingly used LPVO scopes with Brazilian IMBEL FN FAL rifles that were specifically imported or modernized old SLRs.
The rifle in the picture is an old Indian variant L1A1 SLR, easily recognised due to the wooden circular hand guard.
A picatinny rail adaptor may have been used with the IndiaMART scope of some kind of custom fitted adaptor.