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Total questions: 10
Worksheet time: 4mins
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.
Fiber optic cables work because of the principle of _____.
total internal refraction
incomplete internal refraction
total internal reflection
partial internal reflection
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.
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.
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
The picture shows:
Specular reflection
A ray diagram
Diffuse reflection
Incident ray angles = Reflected ray angles
The ray of light that strikes a mirror
Reflected Ray
Incidence Ray
Angle of Incidence
Angle of Reflection
The angle between the incident ray and the normal. (X on the diagram)
Angle of X-Ray
Angle of Reflection
Angle of Incidence
Angle of Normal
A ray of light travels from air to glass with an angle of incidence of 42o. If the critical angle is 42o what will happen at the boundary?
refract
totally internally reflect
travel along the boundary
reflect
