Snell's Law

There is nothing faster than the speed of light in a vacuum that we know of.

• True

• False

When light moves from air to water, the speed ....

• Increases

• Decreases

• stays the same

When light moves from glass to air, the speed

• Increases

• Decreases

• Stays the same

When light moves from air to water, the direction

• changes and bends towards the normal

• changes and bends away from the normal

• stays the same

When a beam of light traveling in air enters a glass block, it undergoes a change in

• speed only

• wavelength only

• frequency only

• speed and wavelength

• speed and frequency

What is the index of refraction for a material where the speed of light in that material is 1.0 x 10⁸ m/s? (The speed of light in a vacuum is 3.0 x 10⁸ m/s)

• 1.0

• 1.5

• 2.0

• 2.5

• 3.0

The greater the index of refraction, the ____________ light travels in that material.

• Faster

• Slower

Light travel fastest in

• Air only

• Lucite only

• Medium Y only

• the speed is the same through these materials

Which material will have the lowest index of refraction>

• Air

• Lucite

• Medium Y

• not enough information

A ray of light is incident through glass, with refractive index 1.75, on an interface separating glass and water with refractive index 1.32. If the angle of incidence is 25 degrees, what is the angle of refraction in water? (Be sure your calculator is in degree mode.)

• 25 degrees

• 34 degrees

• 45 degrees

• 90 degrees