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← ScienceWhich mechanism causes gravitational lensing as photons pass a black hole?
A)Spacetime curvature creates refractive index gradients✓
B)Quantum entanglement redirects photon trajectories
C)Hawking radiation polarizes the photons
D)Frame dragging imparts angular momentum
💡 Explanation
Gravitational lensing occurs because a massive object's spacetime curvature creates a varying refractive index. Therefore, light bends toward the mass, rather than traveling in a straight line; other options do not directly alter the photon path.
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