In Coming to the Conclusion That Lightbeams Are Bent by Gravity

question 22

Multiple Choice

In coming to the conclusion that lightbeams are bent by gravity, Einstein reasoned that

• A) accelerated observers would find that lightbeams bend, so gravity must also bend lightbeams.
• B) increased mass at higher velocities causes increased gravitational effects, so lightbeams moving at lightspeed should have gravitational effects.
• C) since all observers experience the same laws of physics, Newton's theory of gravity must apply to lightbeams.
• D) fast- moving observers would find that lightbeams bend, so gravity must also bend lightbeams.
• E) since lightspeed is the same for all observers, moving observers would observe that lightbeams bend.

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