(New tips are continually added to these pages. Check back in a few months' time for more)
TOPIC 8: Waves, Superposition, Interference and Diffraction
The Diffraction Grating is more closely related to Young's Double Slit than to Diffraction.
In fact, the Diffraction Grating can be considered as a "Young's Multiple Slits"; or alternatively, Young's Double Slit is a "Two-Slit Diffraction Grating".
So the formula d sin q = nl is applicable to both Young's double slit as well as to Diffraction Grating. But the formula fringe separation x = lD/d is only applicable to Young's double slit and not the Diffraction Grating, due to the relatively large angles involved in the Diffraction Grating.
© Copyright Physics.com.sg (Registration No. 52890077C). All rights reserved.
® First Class in Physics Tuition is the Registered Trademark (TM No. T02/02149B) of Physics.com.sg