33. Geometric Optics

Refraction of Light & Snell's Law

Multiple Choice
When observing a fish underwater from above the surface, what causes the fish’s position to appear shifted from its actual location?
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Multiple Choice
When a light ray passes from medium $1$ into medium $2$ and its speed increases, which of the following correctly describes the change in direction of the ray according to Snell's Law ( $n_{1} \sin θ_{1} = n_{2} \sin θ_{2}$ )?
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Multiple Choice
Light shines from a laser in air down into water. If the laser beam in air makes an angle of $40 °$ with the water's surface, what angle will it make with the surface under water?
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Multiple Choice
A graduated cylinder is filled with $14 cm$ of oil floating on $20 cm$ of water. How long, in nanoseconds, does it take light to travel from the top of the oil to the bottom of the water?
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Multiple Choice
Suppose a ray of light starts in air, then enters a slab of diamond with parallel faces, and then exits again. If the ray entered the diamond at an angle $θ_{i}$ from a line normal to the diamond slab, what is true of the final angle from normal $θ_{f}$ ?
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Multiple Choice
A laser pointer emits a ray which enters a quartz crystal at an angle 50° with the normal to the surface of the crystal. The ray bends inside the crystal, making an angle of 30° with the normal. Find the index of refraction of quartz.
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Multiple Choice
A ray of light is incident on a glass pane with an angle of 60°. The light partially reflects and partially refracts. What is the angle θ between the reflected and refracted rays?
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