What is this? 1 1

[John Rowley]

Is this normal? It appears to be in the plastic. Looks like water or something? 

[CGC Mike]

Hello

These are called newton rings, and are an optical illusion. 

Mike

[jokiing]

 

[shadroch]

CGC is the leader in Newton Ring technology. While they didn't invent it, they have perfected it . While the older slabs would occasionally show signs of it, they could be fixed with a simple solution. CGCs new cases eliminate that cure and made the rings on the new slabs permanent. Only official CGC products come with Newton Rings.

[Sigur Ros]

On 9/18/2022 at 10:16 AM, shadroch said:

While they didn't invent it

I mentioned the same about the QR code and got reprimanded.  I think we're supposed to say they did invent it.

 

[Sigur Ros]

On 9/17/2022 at 2:13 PM, John Rowley said:

Is this normal? It appears to be in the plastic. 

It's the reflection of light when two pieces of plastic touch.  Nothing wrong with the book.

But yes, at CGC it is very normal.

[theCapraAegagrus]

Newton Rings!

[SpineTic]

Quantitative Relationships

 

Fig. 5: Newton's rings seen in two plano-convex lenses with their flat surfaces in contact. One surface is slightly convex, creating the rings. In white light, the rings are rainbow-colored, because the different wavelengths of each color interfere at different locations.

 

Rainbow-colored Newton's rings on an Agfacolor slide (slightly right of center on the houses and upper right on the mountains).

For illumination from above, with a dark center, the radius of the N^th bright ring is given by

rN=[λR(N−12)]1/2,{\displaystyle r_{N}=\left[\lambda R\left(N-{1 \over 2}\right)\right]^{1/2},}

where N is the bright-ring number, R is the radius of curvature of the glass lens the light is passing through, and λ is the wavelength of the light. The above formula is also applicable for dark rings for the ring pattern obtained by transmitted light.

 

Given the radial distance of a bright ring, r, and a radius of curvature of the lens, R, the air gap between the glass surfaces, t, is given to a good approximation by

 

t=r22R,{\displaystyle t={r^{2} \over 2R},}

 

where the effect of viewing the pattern at an angle oblique to the incident rays is ignored.

[Sigur Ros]

On 9/19/2022 at 10:10 AM, Hottohman said:

I think there's a little more to the story than that.

It will never matter what you think.

[John Rowley]

Thanks for the replies! Much appreciated. I’m new at this, so had no idea. 

[PovertyRow]

On 9/19/2022 at 6:14 AM, ak47po said:

Quantitative Relationships

 

Fig. 5: Newton's rings seen in two plano-convex lenses with their flat surfaces in contact. One surface is slightly convex, creating the rings. In white light, the rings are rainbow-colored, because the different wavelengths of each color interfere at different locations.

 

Rainbow-colored Newton's rings on an Agfacolor slide (slightly right of center on the houses and upper right on the mountains).

For illumination from above, with a dark center, the radius of the N^th bright ring is given by

rN=[λR(N−12)]1/2,{\displaystyle r_{N}=\left[\lambda R\left(N-{1 \over 2}\right)\right]^{1/2},}

where N is the bright-ring number, R is the radius of curvature of the glass lens the light is passing through, and λ is the wavelength of the light. The above formula is also applicable for dark rings for the ring pattern obtained by transmitted light.

 

Given the radial distance of a bright ring, r, and a radius of curvature of the lens, R, the air gap between the glass surfaces, t, is given to a good approximation by

 

t=r22R,{\displaystyle t={r^{2} \over 2R},}

 

where the effect of viewing the pattern at an angle oblique to the incident rays is ignored.

In a simpler form you could think of it as ot unlike the reflections of an oil slick on water.  

[Gaard]

On 9/19/2022 at 9:14 AM, ak47po said:

Quantitative Relationships

 

Fig. 5: Newton's rings seen in two plano-convex lenses with their flat surfaces in contact. One surface is slightly convex, creating the rings. In white light, the rings are rainbow-colored, because the different wavelengths of each color interfere at different locations.

 

Rainbow-colored Newton's rings on an Agfacolor slide (slightly right of center on the houses and upper right on the mountains).

For illumination from above, with a dark center, the radius of the N^th bright ring is given by

rN=[λR(N−12)]1/2,{\displaystyle r_{N}=\left[\lambda R\left(N-{1 \over 2}\right)\right]^{1/2},}

where N is the bright-ring number, R is the radius of curvature of the glass lens the light is passing through, and λ is the wavelength of the light. The above formula is also applicable for dark rings for the ring pattern obtained by transmitted light.

 

Given the radial distance of a bright ring, r, and a radius of curvature of the lens, R, the air gap between the glass surfaces, t, is given to a good approximation by

 

t=r22R,{\displaystyle t={r^{2} \over 2R},}

 

where the effect of viewing the pattern at an angle oblique to the incident rays is ignored.

  nerd

[Readcomix]

You people are all wrong — it’s a bad drawing of Wolverine and Sabertooth. Sheesh.