Q: Rear camera show black screen after falling down.

i have got iPhone 6,64 GB. It's iOS is 9.3.5. My phone fell down and its rear camera stop worKing.  The rear camera is showin a black screen where as the font camera is working very properly.  i have res my phone and reset it but my camera is still showing a black screen. I tried opening the flash and the filters but they are also not opening. The camera is also not opening from any other application.  When I open the fron camera and then then the back camera, the screen of the back camera start showin the view captured from the front camera. I don't knoe what to do and I am very upset from this.  This is m new phone and I don't want to loose its camera. PLEASE TELL ME HOW TO FIX MY REAR CAMERA. It is only showing a balck screen.