Please help moment of illumination if it is correctly synchronized with and cloc

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Please help

moment of illumination if it is correctly synchronized with and clock A? Express your answer in milliseconds (that R2B.9 Suppose you are in an inertial frame in empty ef space with a clock, a telescope, and a powerful strobe rams? light. A friend is sitting in the same frame at a very large (unknown) distance from your clock. At precisely 12:00:00 noon according to your clock, you set off the strobe lamp. Precisely 30.0 s later, you see in your telescope the face of your friend's clock illuminated by your strobe flash. (a) How far away is your friend from you (in seconds)? (b) What should you see on the face of your friend's clock if that clock is synchronized with yours? R2.13, giving Draw a spacetime diagram that displays worldlines R2B.10

Explanation / Answer

Since both are in same frame, there will be no relative velocity between the frames. Hence this problem can be solved easily by normal speed distance time relations

(a)

The distance between you and your friend is the speed of light times the time taken by it to travel. SInce light goes and comes back for you to see your friend, both are 15 light seconds away.

This means a distance of 15c= 45 lakh km (approx)

(b)

Your friend's clock will read 15 seconds backward than your time which is 15 seconds past 12.00 noon or 12:00:15. This is because you see the time that is 15s backwards due to large distance between you two

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