refraction and total internal reflection

Why does the pencil appear bent?

• Light rays travelling from parts of the pencil above the water bend away from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

• Light rays travelling from parts of the pencil above the water bend towards from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

• Light rays travelling from parts of the pencil under the water bend away from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

• Light rays travelling from parts of the pencil under the water bend towards from the normal and appear closer to the horizontal surface, thus making the pencil appear broken.

What does part #2 in the system represent?

• Light signals are what carries information in fiber optics

• Digital signals are sent through fiber optic cables

• Total internal reflection keeps the light inside of the cable

• Lasers are the source of light that we send in fiber optics

• Glass or plastic fiber optic cables carry information as light

Tags

NGSS.MS-PS4-2

^{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

Tags

NGSS.HS-PS4-5

^{Which one is true for the formation of a mirage?}

• The light first goes through TIR and then passes through the colder layers of air to hotter layers. (TIR is total internal reflection)

• The light first goes through TIR after passing through the colder layers of air to hotter layers.

• The light first goes through TIR and then passes through the hotter layers of air to colder layers.

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.

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-5

Fiber optic cables work because of the principle of _____.

• total internal refraction

• incomplete internal refraction

• total internal reflection

• partial internal reflection

_____ 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

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

NGSS.HS-PS4-5

Which of the following statement about optical fibre is incorrect?

• Light is totally internally reflected down the fibre.

• It is used in medical (endoscope).

• It is used in fibre optic communication.

• Angle of incidence of light in optical fibre must less than critical angle.

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.

Tags

NGSS.HS-PS4-5

Light travels through a glass block as shown. Which angle is the critical angle for light in the glass?

• A

• B

• C

• D