To obtain an observable double-slit fringe pattern:
A)the light must be incident normally on the slits
B)the light must be monochromatic
C)the light must consist of plane waves
D)the light must be coherent
E)the screen must be far away from the slits

Question

Quizplus · Accepted Answer

For an observable double-slit fringe pattern, the light must be coherent, meaning that the light waves must have a constant phase relationship. Without coherence, the waves from the two slits would interfere randomly, making the pattern indistinct. The other options may affect the quality or characteristics of the pattern, but coherence is the most crucial factor.

To Obtain an Observable Double-Slit Fringe Pattern