Light travels from air (n1 = 1.00) into crown glass (n2 = 1.50) at an angle of incidence of 30 degrees. Find sin(theta2) for the refracted ray.
Answer and explanation
Correct answer: B. 1/3
- Step 1: Apply Snell's Law of refraction: n1 sin(theta1) = n2 sin(theta2).
- Step 2: 1.00 sin(30 degrees) = 1.50 sin(theta2). Since sin(30) = 0.5, sin(theta2) = 0.5 / 1.5 = 1/3.
Answer
1/3.
Why not the others: '3/4' multiplies by 1.5 instead of dividing; '1/2' assumes the angle of refraction equals the angle of incidence; '2/3' inverts 1.5.
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