Refraction and Reflection

The higher the index of refraction, the faster light travels in that medium

• True

• False

Tags

NGSS.HS-PS4-1

When measuring critical angles and angles of incidence, reflection, refraction, measure from

• the horizontal (where the barrier of the two mediums is)

• the normal (perpendicular to where the barrier of the two mediums is)

• wherever you want

Light traveling from a low index of refraction to a higher index of refraction will get faster and bends toward the normal.

• True

• False

Why does the pencil appear bent?

• Light rays travel from parts of the pencil above the water to your eye and they bend away from the normal and appear closer to the horizontal surface.

• Light rays travel from parts of the pencil under the water, through the air, and then into your eye. They bend toward the normal and appear farther from the horizontal surface.

• Light rays travel from parts of the pencil under the water, through the air, and then into your eye. They bend away from the normal and appear closer to the horizontal surface.

Using Snell's Laws, set up how you would solve for the index of refraction of a refractive liquid if the angle of incidence in the air (n = 1) is 35 degrees and the angle of refraction is 14 degrees? Then solve.

• n (sin35) = (1)(sin14) ... n = 0.42

• n (sin35) = (1)(sin14) ... n = 2.37

• (1)(sin35) = n (sin14) ... n = 2.37

• (1)(sin35) = n (sin14) ... n = 0.42

If light is traveling from air to water with an angle of INCIDENCE of 40 degrees, what is the angle of refraction? (n=1 air, n=1.33 water)

• 48 degrees

• 2.07 degrees

• 11.9 degrees

• 28.9 degrees

A person shines a light at a friend who is swimming underwater. If the ray in the water makes an angle of 36.2 with the normal, what is the angle of incidence?

(n=1 air, n=1.33 water)

• 26.4 degrees

• 2.25 degrees

• 51.8 degrees

• not possible

A ray of light enters the top of a glass of water at an angle of 36 degrees with the vertical. What is the angle between the refracted ray and the vertical?

• 2.26 degrees

• 26.2 degrees

• 51.4 degrees

• 36.5 degrees

_____ cables transmit beams of light without allowing any of the light to escape until it gets to the end of the cable.

• Ethernet

• Fiber optic

• Copper

• Coaxial

Fiber optic cables work because of the principle of _____.

• total internal refraction

• incomplete internal refraction

• total internal reflection

• partial internal reflection