Light is incident inside a glass block toward the plane surface in contact with air

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

Light is incident inside a glass block (n=1.50)(n=1.50) toward the plane surface in contact with air (n=1.00)(n=1.00). Find the critical angle for this interface (in degrees). (a) 48.6∘48.6^{\circ} (b) 33.7∘33.7^{\circ} (c) 41.8∘41.8^{\circ} (d) 30.0∘30.0^{\circ}

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