Light Fringes Change When Intensity of One Slit is Reduced

• copitlory8
In summary, the change in light fringes when the intensity of one slit is reduced is caused by the phenomenon of interference, where the amount of light passing through two slits creates a pattern of constructive and destructive interference. Reducing the intensity of one slit directly affects the overall intensity of the light fringes, as less light is available for interference. This change in intensity also affects the number of light fringes observed, as determined by the wavelength of light and distance between the slits. The width of the slits can also impact the change in light fringes, with narrower slits resulting in a more noticeable effect. While the change in light fringes can be used to determine the relative intensity of light passing through each slit, absolute intens
copitlory8
Monochromatic light passes through two slits and produces light and dark fringes on a screen. Initially, the light from the two slits is of equal intensity. The light from one slit now had its intensity reduced. The intensity at the other is unchanged. What changes if any will occur in the appearance of the fringes on the screen.

Hello copitlory8,

What do you think? Can you explain why the fringes appear to begin with?

1. What is the cause of the change in light fringes when the intensity of one slit is reduced?

The change in light fringes is caused by the phenomenon of interference. When light passes through two slits, it diffracts and creates a pattern of constructive and destructive interference, resulting in light and dark fringes. When the intensity of one slit is reduced, the amount of light passing through that slit decreases, altering the interference pattern and causing a change in the light fringes.

2. How does the intensity of one slit affect the overall intensity of the light fringes?

The intensity of the light fringes is directly related to the intensity of the light passing through the slits. Therefore, reducing the intensity of one slit will also reduce the overall intensity of the light fringes. This is because less light is available for interference, resulting in a decrease in the brightness of the fringes.

3. Will changing the intensity of one slit affect the number of light fringes observed?

Yes, changing the intensity of one slit will affect the number of light fringes observed. The number of fringes is determined by the wavelength of light and the distance between the slits. When the intensity of one slit is reduced, the interference pattern changes, leading to a change in the number of fringes observed.

4. How does the width of the slits affect the change in light fringes when the intensity of one slit is reduced?

The width of the slits can also affect the change in light fringes when the intensity of one slit is reduced. If the slits are very narrow, the fringes will be closer together and the change in intensity of one slit will have a more noticeable effect on the overall interference pattern. On the other hand, wider slits will result in wider fringes and a smaller change in intensity will be observed.

5. Can the change in light fringes be used to determine the intensity of the light passing through each slit?

Yes, the change in light fringes can be used to determine the relative intensity of the light passing through each slit. By measuring the change in the interference pattern, the relative intensities can be calculated using mathematical equations. However, the absolute intensities cannot be determined without additional information about the light source and the experimental setup.

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