In youngs double-slit experiment, sodium lamp is replaced by a blue-light lamp. Then: \( \mathrm...

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In youngs double-slit experiment, sodium lamp is replaced by a blue-light lamp. Then:
\( \mathrm{P} \)
(1) the fringes will become brighter.
W
(2) the fringes will become fainter.
(3) the fringe width will increase.
(4) the fringe width will decrease.
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