Digital ACT Science Practice Question #1534
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Lowest critical angle = Cladding C (60.1°).
Sin(theta_c) = n_clad / n_core. Lower cladding index yields a lower critical angle (60.1° for Cladding C), allowing reflection over a wider range of angles....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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