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

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.

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

What is refraction effect in gravitational field?

Edited November 30, 201312 yr by DimaMazin

What is refraction effect in gravitational field?

Read here.

There is no change in medium for light propagating in vacuum.

Read here.

There is no change in medium for light propagating in vacuum.

Well.Does only length contraction factor create lensing?Does gravitational slowing of time create lensing?

Well.Does only length contraction factor create lensing?Does gravitational slowing of time create lensing?

Neither. Read here

Neither. Read here

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

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 December 1, 201312 yr by DimaMazin

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

 

Yes it is. To refract: to deflect.

 

Yes it is. To refract: to deflect.

 

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.

 

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 December 2, 201312 yr by decraig

what's an index and how is it causal?

 

 

Refraction index = speed of light in vacuum / speed of light in medium

 

RI of water = 1.0c / 0.75c = 1.333

Edited December 3, 201312 yr by Sensei

 

Refraction index = speed of light in vacuum / speed of light in medium

 

 

And caused by the light interacting with the material.

 

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?

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

 

If it's gravitational, it's not refraction. This hasn't changed in the past week.

 

If it's gravitational, it's not refraction. This hasn't changed in the past week.

Does "laser prism" deflect light,which travels through it?

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.

Does "laser prism" deflect light,which travels through it?

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.

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 December 7, 201312 yr by DimaMazin

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.

 

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?

Again, I don't know what you mean by a laser prism.

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?

Such equation can be right only with one measurement unit. Isn't it?The equation is useless for me because I don't know the measurement unit.

What is measurement unit of the angle?

Radian.

Thank you very much, xyzt.

What is variable refractive index? Is it =1/(1-2GM/rc²) ?

Edited December 27, 201312 yr by DimaMazin