The Student Room Group

june 2011 question 6ai-g482 ocr physics as

why is a single slit needed to make the light coherent at the double slits?
so that both waves have a constant phase difference
Reply 2
Original post by Coveted Ul
so that both waves have a constant phase difference


but won't they still be coherent without the single slit as they from one source and when they are diffracted by the double slits they are in phase

Quick Reply