DimaMazin Posted November 30, 2013 Posted November 30, 2013 Does only lensing cause refraction of light in vacuum?Does gravitational or electromagnetic slowing of time cause additional refraction of light?
xyzt Posted November 30, 2013 Posted November 30, 2013 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. 1
DimaMazin Posted November 30, 2013 Author Posted November 30, 2013 (edited) The gravitational lensing is not refraction, it is a different effect. What is refraction effect in gravitational field? Edited November 30, 2013 by DimaMazin
xyzt Posted November 30, 2013 Posted November 30, 2013 What is refraction effect in gravitational field? Read here. There is no change in medium for light propagating in vacuum. 1
DimaMazin Posted November 30, 2013 Author Posted November 30, 2013 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?
xyzt Posted November 30, 2013 Posted November 30, 2013 Well.Does only length contraction factor create lensing?Does gravitational slowing of time create lensing? Neither. Read here 1
DimaMazin Posted December 1, 2013 Author Posted December 1, 2013 (edited) 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, 2013 by DimaMazin
decraig Posted December 2, 2013 Posted December 2, 2013 The gravitational lensing is not refraction, it is a different effect. Yes it is. To refract: to deflect.
swansont Posted December 2, 2013 Posted December 2, 2013 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.
decraig Posted December 2, 2013 Posted December 2, 2013 (edited) 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, 2013 by decraig
Sensei Posted December 3, 2013 Posted December 3, 2013 (edited) 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, 2013 by Sensei
swansont Posted December 3, 2013 Posted December 3, 2013 Refraction index = speed of light in vacuum / speed of light in medium And caused by the light interacting with the material.
DimaMazin Posted December 5, 2013 Author Posted December 5, 2013 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?
swansont Posted December 5, 2013 Posted December 5, 2013 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.
DimaMazin Posted December 7, 2013 Author Posted December 7, 2013 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?
Endercreeper01 Posted December 7, 2013 Posted December 7, 2013 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.
John Cuthber Posted December 7, 2013 Posted December 7, 2013 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.
DimaMazin Posted December 7, 2013 Author Posted December 7, 2013 (edited) 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, 2013 by DimaMazin
swansont Posted December 9, 2013 Posted December 9, 2013 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.
DimaMazin Posted December 9, 2013 Author Posted December 9, 2013 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?
swansont Posted December 9, 2013 Posted December 9, 2013 Again, I don't know what you mean by a laser prism.
DimaMazin Posted December 11, 2013 Author Posted December 11, 2013 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?
DimaMazin Posted December 12, 2013 Author Posted December 12, 2013 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.
xyzt Posted December 12, 2013 Posted December 12, 2013 What is measurement unit of the angle? Radian. 1
DimaMazin Posted December 27, 2013 Author Posted December 27, 2013 (edited) Thank you very much, xyzt. What is variable refractive index? Is it =1/(1-2GM/rc2) ? Edited December 27, 2013 by DimaMazin
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