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In young's double slit experimental the ...

In young's double slit experimental the separation d between the slits is 2 mm, the wavelength `lambda` of the light used is 5896Å and distance D between the screen and slitps is 100 cm . It is found that the angular width of the fringes is `0.20^(@)` . To increase the fringe angular width to `0.21^(@)` (with same `lambda` and D) the separation between the slits needs to be changed to

A

1.9 mm

B

2.1 mm

C

1.8 mm

D

1.7 mm

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The correct Answer is:
A
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