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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_____ 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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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

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

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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

The refractive index of a glass prism is 1.9. Determine its critical angle.

• 23^o

• 30^o

• 32º

• 35^o

see image

• A

• B

• C

• D

see image

• A

• B

• C

• D