1.

In Young's double slit experiment if width of the slit is made (1)/(3) th times width of fringe becomes n times then n ......

Answer»

3
`(1)/(3)`
9
`(1)/(9)`

SOLUTION :Width of fringe `beta=(lambdaD)/(2d)` here `LAMBDA, D and 2` are constant,
`:. Beta prop (1)/(d)`
`:. (beta_(2))/(beta_(1))=(d_(1))/(d_(2))`
`:. (beta_(2))/(beta_(1))=(d)/((d)/(3))=3`
`:. (n beta_(1))/(beta_(1))=3 "" :. n=3`


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