Total Internal reflection

Total Internal reflection

Fast start

complete the table using the following slides

Fill in the Blanks

Ray 1

Fill in the Blanks

Ray 2 (to 2 s.f)

Fill in the Blanks

Ray 3 (to 2 s.f)

Fill in the Blanks

Ray 4 (to 2 s.f)

Fill in the Blanks

Ray 5 (to 2 s.f)

Open Ended

What happened when the ray reached an angle of incidence of 

 $50^o$  and why? What would you see?

Total internal reflection

https://www.focuselearning.co.uk/u/33209/CqbkcBFmzadtchEebvpCtbvojAtjqbymr - Focus learning - essential physics - refraction of light and optic fibres

Calculating the critical angle

Multiple Select

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

Multiple Choice

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

Multiple Choice

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

Multiple Choice

_____ 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

Multiple Choice

Fiber optic cables work because of the principle of _____.

• total internal refraction

• incomplete internal refraction

• total internal reflection

• partial internal reflection

Multiple Choice

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.

Multiple Choice

Light travels from air to water (n=1.33), what is the critical angle?

• 48.8

• 46.4

• 52.4

• not possible

Multiple Choice

Light travels from glass (n=1.66) to water, what is the critical angle for these two mediums?

• 53.2

• 48.8

• 37

• not possible

Multiple Choice

Question a -

• Light is refracted out of the air/diamond interface and reflected

• Total internal reflection takes place only

Multiple Choice

Question b -

• Light is refracted out of the water/diamond interface and reflected

• Total internal reflection takes place only

Further practice

• Page 174 - 175 text book - answer questions 1 to 4

• You will be asked to share your answers later