Why Do Observers A and B Perceive Light Arrival at Different Times?

[seto6]

here this time for the experimenter A t=4 micro sec and for B t=3 micro sec.

shouldn't they see the light at when light reaches there as in At=2 micro sec and Bt= 1micro sec.

i do not get this example could someone explain this to me.

thanks in advance
Seto

 

[Krb686]

If you read carefully after the Solve portion, it says the explosion occurred at 2 microseconds into the 'time frame', which simply adds 2 microsec. to what you are stating, so 4 and 3 respectively for observers A and B. It does only take 2 microsecs and 1 microsec to reach A and B, but the problem is essentially trying to get you to find when the explosion occurred.

 

[seto6]

i mean in stead of At=4 and Bt=3 shouldn't it me like At=2 and Bt=1?

when light reaches there they should be able to see it..so where does the extra 2 for At and extra 2 for Bt come from

 

[seto6]

oh its the time at which explosion took place