total internal reflection

What happens to light during total internal reflection?

• The light reflects back into the original medium at the same angle.

• The light refracts closer to the normal line.

• The light refracts farther away from the normal line.

• The light reflects at the angle it would have refracted at.

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

What is total internal reflection

• Where a wave is refracted at the boundary between a dense medium and a less dense medium when the angle of incidence is greater than the critical angle.

• Where a wave is refracted at the boundary between a dense medium and a less dense medium when the angle of incidence is smaller than the critical angle.

• Where a wave is reflected at the boundary between a dense medium and a less dense medium when the angle of incidence is greater than the critical angle.

• Where a wave is reflected at the boundary between a dense medium and a less dense medium when the angle of incidence is smaller than the critical angle.

When will total internal reflection occur?

• When light travels from a less dense to a more dense medium

• When the angle of incidence is smaller than the critical angle

• When the angle of incidence is greater than the critical angle

• When the light cannot pass through a medium

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

For total internal reflection to occur, light must

• travel from a more dense to a less dense medium

• travel from a less dense to a more dense medium

Fiber optic cables work because of the principle of _____.

• total internal refraction

• incomplete internal refraction

• total internal reflection

• partial internal reflection

Chose the TWO conditions are NOT correct for total internal reflection to take place

• The incident angle should be less than the critical angle

• The incident angle should be greater than the critical angle

• Light should travel from a denser to a lighter medium

• Light should travel from a lighter to a denser medium

^{What is the refractive index of a fibre optic pipe if the critical angle is 30 degree?}

^{Outside is air.}

• 2.0

• 1.7

• 2.4

Which diagram correctly describes the critical angle c for air-water surface?

• A

• B

• C

• D