White bright light on unlocking the phone while using the touch ID

Whenever i unlock my phone using touch finger id , a bright white light comes up on the left top corner.

Hey there Vishesh Narang,
It sounds like you are getting a flash of light in the upper left corner of your screen when you unlock the phone using Touch ID. I would start by quitting all the open apps first:
iOS: Force an app to close
http://support.apple.com/kb/ht5137
Double-click the Home button.
Swipe left or right until you have located the app you wish to close.
Swipe the app up to close it.
When you have done that and restart the phone and test the issue again:
iOS: Turning off and on (restarting) and resetting
http://support.apple.com/kb/ht1430
If it persists, I would next backup your device to iTunes with this article:
iOS: How to back up and restore your content
http://support.apple.com/kb/HT1766
And restore it from your backup with this article to delete the current iOS installation, and install a fresh copy
Use iTunes to restore your iOS device to factory settings
http://support.apple.com/kb/ht1414
Thank you for using Apple Support Communities.
All the very best,
Sterling

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