Why Do Fringes Occur on Lens of Mobile Camera?

[mkbh_10]

Below is the picture of a Newton rigns experiment but u can see the rings at the lens surface outside the apparatus , what is the reason for these fringes to occur ?

The pic was taken with a mobile camera (2MP)

1st explanation :I think this is like two virtual sources of fresnel biprism , here the lens is ciruclar so the light from sodium lamp strikes it & there must be something inside the lens that produces these fringes .

2nd explanation : Light travels thru glass plate from fringes formed in apparatus & intereferes at the lens of camera with the direct light come from sodium lamp & both r in same phase to give interference pattern .

I am more in favour of my 1st thought , what do u guys think ??

 

[eljose79]

I would like to provide some insights on the possible reasons for the occurrence of these fringes in the Newton rings experiment.

Firstly, it is important to understand the basic principle of the Newton rings experiment. This experiment involves the interference of light waves reflected from the top and bottom surfaces of a thin air film trapped between a convex lens and a flat glass plate. This interference results in the formation of concentric rings of bright and dark fringes.

Now, coming to the fringes observed at the lens surface outside the apparatus, there could be several explanations for this phenomenon. One possibility is that there could be a thin layer of air or some other substance on the surface of the lens, which is causing interference with the incident light and producing these fringes. This could be due to imperfections in the lens surface or some external factors.

Another explanation could be related to the camera used to capture the image. The 2MP mobile camera may not have the capability to capture the fine details of the fringes, resulting in a blurry image with visible fringes at the lens surface. This could also be due to the angle at which the photo was taken, as it can affect the visibility of the fringes.

In terms of the two explanations provided in the forum post, I would agree with the 2nd explanation that the fringes could be due to the interference of light traveling through the glass plate and interfering with the direct light from the sodium lamp. However, further investigation and experimentation would be needed to confirm the exact cause of these fringes.

In conclusion, the fringes observed at the lens surface outside the apparatus could be due to various factors such as imperfections in the lens surface, external factors, or limitations of the camera used. More research and experimentation would be needed to fully understand and explain this phenomenon.

 

[charng]

I would like to provide a comprehensive explanation for the occurrence of fringes on the lens of a mobile camera. Fringes occur due to the phenomenon of interference, which is the interaction of two or more waves. When light passes through the lens of a mobile camera, it undergoes refraction and forms a focused image on the camera's sensor. However, due to the presence of imperfections or irregularities on the lens surface, some light rays may deviate from their original path and interfere with each other.

This interference results in the formation of fringes, which are areas of constructive and destructive interference. In the case of the Newton rings experiment, the fringes are formed due to the interference between the light reflected from the top and bottom surfaces of the glass plate. Similarly, when light passes through the lens of a mobile camera, it can interact with the light reflected from the lens surface and produce fringes.

The size and shape of the fringes depend on the wavelength of light, the thickness of the lens, and the angle of incidence. This is why the fringes may appear different when using different light sources or changing the angle of the camera. Additionally, the quality of the lens also plays a crucial role in the formation of fringes. A lens with fewer imperfections will produce fewer fringes compared to a lens with more imperfections.

In conclusion, the fringes observed on the lens of a mobile camera are a result of the interference of light rays passing through the lens and interacting with the lens surface. These fringes can provide valuable information about the quality of the lens and can be used to improve the design and manufacturing process of mobile cameras.