10. If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by a monochromatic blue light of the same intensity :
(a) fringe width will decrease
(b) fringe width will increase
(c) fringe width will remain unchanged
(d) fringes will become less intense
Answer : (a) fringe width will decrease
fringe width , \(\beta = \frac{\lambda D}{d}\)
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