If the wavelength of light is kept const...

If the wavelength of light is kept constant and the biprism is moved towards the screen, then the fringe width

decreases

increases

remains unchanged.

cannot be determined.

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In young's double slit experiment with monochromic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by 5 cm towards the slits, then the change in fringe width is 30mum if the distance between the slits is 1mm, then calculate wavelength of the light used.

In a YDSE setup interference fringes are obtained by sodium light of wavelength 5890Å . On screen the fringes have an angular width 0.20^(@) . Now the wavelength of light is changed and it is found that fringe width increases by 10%, the new wavelength of incident light is :

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