Question

1. Light in air is incident upon a piece of crown glass at an angle of 45 degrees. What is the angle of refraction? (INCLUDE A DIAGRAM-to scale, on graph paper) 2. A ray of light passes from air into water at an angle of 30 degrees. Find the angle of refraction. (INCLUDE A DIAGRAM-to scale, on graph paper)

Answer 1

1) Use Snell's law

n₁sin$\theta$₁ = n₂sin$\theta$₂

sin$\theta$₂ = n₁ sin$\theta$₁ / n₂

_$\theta$2 = arcsin (1 * sin 45 / 1.52)

_$\theta$2 =27.7 degree

45

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2)

Use Snell's law

n₁sin$\theta$₁ = n₂sin$\theta$₂

sin$\theta$₂ = n₁ sin$\theta$₁ / n₂

_$\theta$2 = arcsin ( 1 * sin 30 / 1.33)

_$\theta$2 = 22.1 degree

same diagram as above...just change the angles.