In Young's double-slit experiment, fringes form when:
ALight is reflected from a mirror
BLight from a single source is split by two narrow slits and superposes on a screen
CLight is refracted through a prism
DLight passes through a polarizer
Answer & Solution
Correct answer: B. Light from a single source is split by two narrow slits and superposes on a screen
A common primary source illuminates two narrow slits; the slits act as **coherent** secondary sources. Their wavefronts superpose on the screen — constructive at bright fringes (path-difference = $n\lambda$), destructive at dark ones ($\lambda/2 + n\lambda$).
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