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Whose fringe width will be more, the one...

Whose fringe width will be more, the one for red light or the one for yellow light, all other things be the same ?

Text Solution

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We know that `beta=(lambdaD)/d`
Now for same value of D and d `beta propv`
Now `lambda_(red) gt lambda_(Yellow)`
Hence `beta_(red) gt beta_(yellow)`
Hence, fringe width will be greater when red coloured light is used.
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