6.2 Total Internal Reflection F4

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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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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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.

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

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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^{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

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

• A

• B

• C

• D

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

• A

• B

• C

• D

see image

• A

• B

• C

• D