Q .     In a double slit interference experiment, the fringe width obtained with a light of wavelength `5900Å` was `1.2\ mm` for parallel narrow slits placed `2\ mm` apart. In this arrangement, if the salt separation is increased by one-and-half times the previous value, then the fringe width is:

EAMCET 2014
A

`0.9\ mm`

B

`0.8\ mm`

C

`1.8\ mm`

D

`1.6\ mm`

HINT

Fringe width ` \beta = \ frac{\lambda D}{d}`

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