Optics Review Questions

Light bends when it enters a new material. What is this phenomenon called?

• Reflection

• Translucent

• Refraction

• Index

What is the speed of light in a vacuum?

• 3 x 10⁶ m/s

• 3 x 10⁸ m/s

• 3 x 10¹⁰ m/s

• 3 x 10¹² m/s

When a substance is more dense, light that goes through it:

• shines brighter

• goes slower

• goes faster

• none of the above

When light speeds up as it enters a new medium, it bends (a)   from the normal.

When some light is refracted and some reflected, it is called:

• Total internal refraction

• Total internal reflection

• Partial reflection and refraction

• Transparent

What does the index of refraction (n) show?

• The ratio of the speed light in a vacuum to the speed of light in a specific medium

• The ratio of speed of light in a specific medium to the speed of light in a vacuum

• The ratio of the angle of incidence to the angle of refraction

• The ratio of the angle of refraction to the angle of incidence

As "n" increases, "v"

• increases

• decreases

• it's a constant, it doesn't change

What can Snell's Law help you calculate? (Choose more than one.)

• The index of refraction

• The angle of incidence

• The angle of refraction

• The speed of light in that medium

What is the "critical angle"?

• Another name for the angle of incidence

• The angle at which light will reflect back in to a medium

• The angle at which light will refract along the axis separating the two media (mediums)

• Another name for the angle of refraction

"Total internal reflection" happens when: (Choose more than one.)

• You have mirrors

• Light moves into a faster medium

• Light moves into a slower medium

• The angle of incidence is larger than the critical angle

• The angle of incidence is below a critical angle