Practice portal › Wave Optics › Interference and Young's Double Slit Experiment
Asked in GSEB Board March 2020 (old course) · Intensity and coherent sources
Given: Young's arrangement -- one narrow source slit illuminating two closely spaced slits S₁ and S₂.
Idea: coherent sources can be made either by dividing a single wavefront between two openings, or by dividing the amplitude of one beam at a partly reflecting surface.
Here a single wavefront spreading from the source slit reaches the double slit.
Two different parts of that same wavefront pass through S₁ and S₂.
Since both parts began life in the same wavefront, their phase difference is fixed for all time, which is exactly what coherence means.
So the sources are obtained by division of wavefront.
Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.
Practise this with a timer