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Work Function

In ydse using...

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In ydse using light of wavelength 600nm if angular fringe width is0.1degree then separation between 2slits is

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Q. In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is

{0.1}^{\circ}

. What is the spacing between the two slits?

Q. In Young's double slit experiment using monochromatic light of wavelength

600

nm, interference pattern was obtained on a screen kept

1.5

m away from the plane of the two slits. Calculate the distance between the two slits, if fringe separation/fringe width was found to be

1.0

Q. In Young's double slit experiment using monochromatic light of wavelength

600

5^{t h}

bright fringe is at a distance of

0.48

mm from the centre of the pattern. If the screen is at a distance of

80

cm from the plane of the two slits, calculate:
(i) Distance between the two slits.
(ii) Fringe width, i.e., fringe separation.

Q. State two conditions to obtain sustained interference of light. In Young's double slit experiment. using light of wavelength

400 n m

, interference fringes of width

^{'} X^{'}

are obtained. The wavelength of light is increased to

600 n m

and the separation between the slits is halved. If one wants the observed fringe width on the screen , to be the same in the two cases, find the ratio of the distance between the screen and the plane of the slits in the two arrangements.

Q. In Young's double slit experiment, if the separation between slit plane and screen is doubled and the wavelength of coherent light used in two slits is halved, then fringe width -

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