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What does cause refraction of light in vacuum?


DimaMazin

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Does only lensing cause refraction of light in vacuum?Does gravitational or electromagnetic slowing of time cause additional refraction of light?

The gravitational lensing is not refraction, it is a different effect.

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Neither. Read here

Thanks. Photon direction change by spherical gravitation is lensing. Then photon direction change by gravitational prism is prisming.smile.png

We can make experiments with gravitational prism.We should place lasers on arch of a circle and direct their rays to one point(for example to center of the circle).Then before the point the rays create gravitational prism.

I don't know maybe scientists made similar experiment.

Edited by DimaMazin
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Refraction is a specific case of deflection caused by a difference in (wait for it) the index of refraction. Refraction is deflection but not all deflection is refraction.

ha ha for the "wait for it" thing.

what's an index and how is it causal?

Edited by decraig
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Refraction is a specific case of deflection caused by a difference in (wait for it) the index of refraction. Refraction is deflection but not all deflection is refraction.

But what about that plural refractions,caused by non-uniform gravitational field,cause gravitational deflection of photon?

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What do you mean by "laser prism"?

Anyway, since refraction of light needs some material to be there to refract the light: it can't happen in a vacuum.

Lasers rays create gravitational field in vacuum,isn't it?The rays can create shape which is some similarity of prism.

Edited by DimaMazin
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Lasers rays create gravitational field in vacuum,isn't it?The rays can create shape which is some similarity of prism.

 

I also don't know what a laser prism is. But a real prism displays dispersion, which AFAIK is not present in gravitational lensing.

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I also don't know what a laser prism is. But a real prism displays dispersion, which AFAIK is not present in gravitational lensing.

Correct. But real lens makes refraction,gravitational lensing doesn't refract(agreeing with you),but yet it is lensing.An analogue of a thing is not the same thing. Lasers prism doesn't display dispersion,but can it deflect light?

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In a vacuum, the path of light is bent by gravity, and this is called gravitational lensing.

The angle of deflection is 4GM/(rc2), where c is the speed of light, r is the distance from the mass, G is the gravitational constant, and M is mass.

What is measurement unit of the angle?

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