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Wavefronts of Light

Why does the ...

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Why does the position of other bands except bright fringe in the centre, depends on the wavelength in the diffraction??

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Q. If X is a fringe width then the distance fifth between fifth dark band on one side fifth bright band on other side of centre bright band is :

Q. A single slit of width

0.14 mm

is illuminated normally by monochromatic light and diffraction bands are observed on a screen

2 m

away. If the centre of the second dark band is

1.6 cm

from the middle of the central bright band, the wavelength of light used.

Q. Which combination of wavelength and lines/meter will cause the first bright fringe to be closest to straight ahead on a screen in front of a diffraction grating?

Q. What will be the effect on the width of the central bright fringe in the diffraction pattern of a single slit if:

(1)

Monochromatic light of smaller wavelength is used.

(2)

Slit is made narrower

Q. In YDSE distance between the slits and screen is

1.5 m

. When light of wavelength

500 nm

2^{n d}

bright fringe is obtained on the screen at a distance of

10 mm

from the central bright fringe. What will be shift in position of

2^{n d}

bright fringe, if light of wavelength

550 nm

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