Total internal reflection

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.

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NGSS.HS-PS4-1

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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

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NGSS.HS-PS4-1

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NGSS.HS-PS4-5

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

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.

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.

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

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 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.

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NGSS.HS-PS4-5