The accused was identified as Jagdish Dhakar (32), and is said to be mentally disturbed, the Kowali SHO of Jhalwar, Lakhan Lal Meena told PTI on telephone.
Dhakar was booked under various sections of IPC including 457, 330 and 436 for hurting sentiments of religious people and damaging idol, Meena said.
The accused broke a cement net of Hanuman Temple, and set on fire an idol with "mustard oil" after entering the premises last night, he said, adding the idol was slightly damaged and was blackened due to smoke.