Question

The width of the central bright fringe Wc is equal to
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Answer 1

Answer:

i dont know meaning also

Answer 2

The central bright fringe in a single-slit diffraction pattern has a width that equals the distance between the screen and the slit.

Explanation:

• In Young's double slit experiment, the width of the central bright fringe is equal to the distance between the first dark fringes on the two sides of the central bright fringe. So the width of the central bright fringe is given by $Da Da B. = 2x} = 2 * 2d - d.$    
• The width of the central bright fringe doesn't not change, because it depends only on the wavelength of the light and not on the width of the slit. The central bright fringe becomes wider, because the angle that locate the first dark fringe on either side of the central bright fringe becomes smaller.
• The central bright fringe produced by light of wavelength $5600 Å$ shifts to the position of 5th bright fringe when a thin transparent film of refractive index $1.28$ is introduced in the path of light from one of the two slits.