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# Derive the expression for the fringe width in a Young's double slit experiment. How will the fringe width change if (i) separation between the slits is increased (ii) screen is moved away from the plane of the slits.

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Q1
Derive the expression for the fringe width in a Young's double slit experiment. How will the fringe width change if (i) separation between the slits is increased (ii) screen is moved away from the plane of the slits.
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Q2
How does the fringe width, in Young's double-slit experiment change when the distance of separation between the slits and screen is doubled?
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Q3
In Young's double slit experiment, explain with reason in each case, how the interference pattern changes, when
(i) Width of the slits is doubled
(ii) Separation between the slits is increased and
(iii) Screen is moved away from the plane of slits.
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Q4
In Young's double slit experiment, fringes of certain width are produced on the screen kept at a certain distance from the slits. When the screen is moved away from the slits by 0.1m, fringe width increase by 6×105m. The separation between the slits is 1 mm. Calculate the wavelength of the light used.
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Q5
If the separation between the slits in a Young's double slit experiment is increased, what happens to the fringe-width? If the separation is increased too much, will the fringe pattern remain detectable?
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