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8 problems. P1: 'Light goes from air (n=1) to glass (n=1.5) at 30° to normal. Angle of refraction: sin(θ₂) = sin(30°)/1.5 = ___, θ₂ = ___°' (0.333, 19.5). P2: 'Light in water (n=1.33) hits glass (n=1.5) at 45°. Angle in glass = ___°' (38.8). P3: 'Speed of light in glass (n=1.5) = ___×10⁸ m/s' (2). P

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