Refraction and Snell's law
Grade 11 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
Light travels at 299,792.458 km/s in a vacuum. Water has a refractive index of 1.333. How fast does light travel in it, to the nearest km/s, Ari?
Light travels at 299,792.458 km/s in a vacuum. Plexiglas has a refractive index of 1.49. How fast does light travel in it, to the nearest km/s, Bo?
In the ray diagram, which way does the ray bend as it enters the water, Jun?
- Away from the normal
- Toward the normal
- Along the water's surface
In the ray diagram, why does the ray bend as it enters the water, Kira?
Use the picture in question 3.
- Light travels more slowly in water
- Water pulls the light down
- Light travels faster in water than in air
In the ray diagram, at what angle to the normal does the weaker reflected ray leave, Luz?
Use the picture in question 3.
- 50°
- 28.8°
- 40°
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Refractive indices (Engineering ToolBox)
Material Refractive index n air (0 °C) 1.00029 ice 1.31 water (20 °C) 1.333 quartz glass 1.46 Plexiglas 1.49 diamond 2.417 Using the table, in which material does light travel most slowly, Milo?
- Diamond
- Ice
- Air
Using the table, why is air's index so close to 1, Noah?
- Air bends light more than any other listed material
- Light in air is nearly as fast as in a vacuum
- Air reflects most light
Light passes from air into Plexiglas. Which way does it bend, Ren?
- It doesn't bend
- Toward the normal
- Away from the normal
Light passes from water into air. Which way does it bend, Tala?
- Straight back
- Toward the normal
- Away from the normal
A ray enters a glass block along the normal, at 0°. What happens to its direction, Zee?
- It keeps going straight
- It bends away from the normal
- It bends sharply toward the surface