First slide

Coherent sources and their importance in interference

Question

If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by a monochromatic blue light of the same intensity

Moderate

A

fringe width will decrease
B

fringe width will increase
C

fringe width will remain unchanged
D

fringes will become less intense

Solution

$A s f r i n g e w i d t h i s β = \frac{λ D}{d} a n d λ_{b} < λ_{y,} F r i n g e w i d t h d e c r e a s e s i f l i g h t i s c h a n g e d f r o m y e l l o w t o b l u e .$

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