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.

What happens to the speed of light in a more optically dense medium?

• it slows down

• it speeds up

• stays the same because all light travels at the speed of light

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

• 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

^{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

Choose the correct statement that describes what happens to the ray of light if the critical angle is 48^o and the angle of incidence is 48^o

• refract

• totally internally reflect

• travel along the boundary

_____ 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