GG16
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Hi

Please may someone

describe the change to the pattern seen on the screen when the violet laser is replaced by a green laser. Assume the brightness of the central maximum is the same for both lasers.


I do not understand why the pattern becomes further apart I would have said closer
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username2395571
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Violet light has a shorter wavelength compared to green light. Therefore,when green light is diffracted through the double slits it will diffract by a larger amount compared to the violet light. A greater amount of diffraction will lead to an interference pattern being formed on the screen which is spread out over a wider area, hence the fringe spacing (w) on the interference pattern will be larger with green light compared to violet light.

The fringe spacing is equal to the distance between two individual maxima (bright fringes) on the interference pattern.
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GG16
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(Original post by Chlozza27)
Violet light has a shorter wavelength compared to green light. Therefore,when green light is diffracted through the double slits it will diffract by a larger amount compared to the violet light. A greater amount of diffraction will lead to an interference pattern being formed on the screen which is spread out over a wider area, hence the fringe spacing (w) on the interference pattern will be larger with green light compared to violet light.

The fringe spacing is equal to the distance between two individual maxima (bright fringes) on the interference pattern.
Thank you this really helps
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Eimmanuel
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(Original post by GG16)
Hi

Please may someone

describe the change to the pattern seen on the screen when the violet laser is replaced by a green laser. Assume the brightness of the central maximum is the same for both lasers.


I do not understand why the pattern becomes further apart I would have said closer
You can apply the common fringe formula

 x= \dfrac {\lambda D}{a}

to realise why the pattern becomes further apart.
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username2395571
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(Original post by GG16)
Thank you this really helps
No worries! Good luck for the Physics exam, I'm really nervous
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