1.

In Young's double slit experiemnt the wavelength of light was changed from 7000 Å to 3500 Å.While doubling the separation between slits, which of the following is not rue?

Answer»

width of the fringe changes
the colour of BRIGHT fringe changes
SEPARATION between successive bright fringe changes
the separation between successive dark FRINGES REMAINS same

Solution :`beta = (LAMBDA D)/(d)`, when `lambda. to (lambda)/(2), d. to 2d`
`therefore beta = (lambda)/(2). (D)/(2d) = (beta)/(4)`
The separation between dark and bright fringes decreases.


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