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  4. In Young's double slit experiment the light emited from source has λ=6500 mathringA and the distance between the two slits is 1 mm. Distance between the screen and slit is 1 metre. Distance between third dark and fifth birth fringe will be :

Q. In Young's double slit experiment the light emited from source has and the distance between the two slits is . Distance between the screen and slit is 1 metre. Distance between third dark and fifth birth fringe will be :

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Solution:

Distance of fifth bright fringe is given as


Distance of third dark fringe is given as


.

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5. At two points P and Q on a screen in Young's double slit experiment, waves from slits and have a path difference of 0 and respectively. The ratio of intensities at P and Q will be :

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