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what do you observe?

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we suppose some events are occuring outside a reference frame which is moving with speed of light.

what will the person inside the frame observe?

everything occuring simultaneously or nothing occuring? both cases relate to 0 time interval.

pls reply.

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nothing with mass can be trvelling at the speed of light, it is an invalid reference frame.

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is there any problem in assuming that mass is infinite for the frame of reference regarding my question?

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if we can really measure the relative velocity of 2 photons approaching each other whats the problem in supposing that light itself is the observer?

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is there any problem in assuming that mass is infinite for the frame of reference regarding my question?

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if we can really measure the relative velocity of 2 photons approaching each other whats the problem in supposing that light itself is the observer?

Infinites usually mean "answer no longer makes sense".

Mass increase with velocity can be somewhat misleading, but in no case can it be with respect to the rest frame the mass is in at any given moment.

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a light particle/ soth moving in speed of light must be at rest wrt itself. nothing can say that its really moving. i just wanted to understand its observation.

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The rest frame of a photon is unphysical, any conclusions you form from considering it will therefore also be unphysical.

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In a moving reference frame you will observe everything moving really fast, like in a car in a city.

There are the reference fames moving at the speed of light V_rf = v_light = c/n < c in a transparent medium, and there are even faster than that (but of course with V_rf < c).

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how can the rest frame of something be unphysical which exists itself?

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A slightly dodgy way, but easy way of looking at it is by following some simple logic.

A photon always moves at c in ANY inertial rest frame.

Consider a frame that you set to be at rest with the photon.

What is the speed of a photon in that inertial rest frame?

It must be c as photons are always moving at c. Yet you tried to set it to be at rest.

Therefore there must clearly be something wrong here.

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There is no social mobility when it comes to massless particles. The only way to be in the photon's frame is to be born a photon. There is no way for a massive particle to get into that frame. The math diverges, so there is no transform to describe it in terms of inertial frames.

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