Snell's Law

Snell's Law & Total Internal Reflection

Multiple Choice

A ray of light traveling from air into crown glass strikes the surface at an angle of 30 degrees. What is the angle of refraction? (air n=1, crown glass n=1.532)

• 39.7 degrees
• 19.2 degrees
• 59.1 degrees
• 12.3 degrees

Multiple Choice

What is n₂? Use the image to determine your answer.

• .89

• 1.00 g

• 1.17 g

• 1.17

Multiple Choice

What happens to the frequency of a light wave as it propagates from glass into air?

• It remains constant.

• It slows down.

• It speeds up.

• It bends.

Multiple Choice

Glass has a _____________ index of refraction than air.

• Equal
• Greater
• Less
• Impossible to say

Multiple Choice

What is the index of refraction of a refractive medium if the angle of incidence in the air is 40 degrees and the angle of refraction is 29 degrees?

• 1.32

• 2.06

• 1.523

• 1.586

Multiple Choice

What is the index of refraction of a refractive liquid if the angle of incidence in the air is 35 degrees and the angle of refraction is 14 degrees?

• 1.33

• 2.21

• 2.37

• 1.72

Multiple Choice

If light strikes the surface at a greater angle than the critical angle :

• The ray splits, but the refracted ray only just travels along the surface.

• The ray spits into a refracted ray and a weaker reflection.

• There is no refracted ray, but a total internal reflection takes place.

Multiple Choice

The refractive index of a glass prism is 1.9. Determine its critical angle.

• 23^o

• 30^o

• 32º

• 35^o

Multiple Choice

When the angle of refraction is 90 $$\degree$$  the angle of incidence is called the... 

• Angle of incidence

• Critical angle

• Angle of total internal reflection

• Angle of refraction

Multiple Choice

When angle of incident (i) equals to critical angle (c) if light is traveled from a denser medium to a less dense medium,

• total internal reflection occurs.

• angle of refraction is equal to 90 degree.

• light is refracted out

• light travel in straight line

Multiple Choice

What happens to light during total internal reflection?

• The angle of incidence is greater than the critical angle.

• The angle of reflection is the same as the critical angle.

• The angle of refraction is less than the critical angle.

• The angle of incidence is zero.

Multiple Choice

Fiber optic cables work because of the principle of _____.

• total internal refraction

• incomplete internal refraction

• total internal reflection

• partial internal reflection

Multiple Choice

_____ 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

• Armored

• Coaxial