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NEET 2018 Physics and Chemistry

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Question : 12

Total: 90

In Young’s double slit experiment the separation d between the slits is 2mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to

1.8 mm
1.9 mm
1.7 mm
2.1 mm

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