In Young's experiment, if the entire setup is immersed in a medium of refractive index $n$, the fringe width:
AStays the same
BIncreases by factor $n$
CDecreases by factor $n$ (since $\lambda$ shortens)
DBecomes zero
Answer & Solution
Correct answer: C. Decreases by factor $n$ (since $\lambda$ shortens)
Wavelength in medium $\lambda' = \lambda/n$, so fringe width $w' = \lambda' D/d = w/n$. Hence immersion in water (n=1.33) shrinks fringes by ~25%.
Related questions
Newton originally supported the corpuscular theory of light. The wave theory was strongly In a Young's double-slit experiment, a thin transparent sheet of thickness t and refractivCoherent sources are those that emit waves ofIf polarised light of intensity I passes through a polariser whose axis makes angle θ withAn unpolarised light of intensity I₀ passes through a polariser. The transmitted intensityWhich of the following phenomena is characteristic ONLY of transverse waves and NOT of lonThe polarising angle (Brewster angle) for glass of refractive index 1.5 isThe width of the central maximum in single-slit diffraction on a screen at distance D is