why is the source of light (bulb) placed in front of concave mirror of the torch?

Dear student,                                                                
​Please find below the solution to the asked query  

The source of light (bulb) is placed in front of a concave mirror because the centre of curvature in this mirror lies in front of it. So, it converge the light rays in the centre,as in torch.
Hope this information will clear your doubts about the topic.   
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