Curriculum
Course: Igcse Physics
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Igcse Physics

1. Motion, Forces and Energy

0/161 Dr Dabour Hub Science Diagram and Course Material

2. Thermal Physics

0/75 Dr Dabour Hub Science Diagram and Course Material

3. Waves

0/77 Dr Dabour Hub Science Diagram and Course Material

4. Electricity and Magnetism

0/119 Dr Dabour Hub Science Diagram and Course Material

5. Nuclear Physics

0/39 Dr Dabour Hub Science Diagram and Course Material

6. Space Physics

0/47 Dr Dabour Hub Science Diagram and Course Material
Quiz

3.2.5 Total Internal Reflection – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Total internal reflection can occur when light travels
from glass to air
between two identical materials
through a vacuum
from air to glass
2.
A glass-air boundary has critical angle 42°. A ray hits it from inside at 50°. The ray is
partially transmitted only
totally internally reflected
absorbed
refracted out at 90°
3.
Optical fibres are used for communication because
they need no light source
signals travel faster than light
light stays inside by TIR with very little loss
they are made of metal
4.
A material has n = 2.0. Its critical angle is
30°
45°
60°
26°
5.
In a 45°-45°-90° prism, a ray normal to a short face hits the hypotenuse at 45°. It is turned through
45°
90°
135°
180°
6.
Which is an advantage of prisms over mirrors in binoculars?
They need no glass
They are lighter
TIR reflects almost all the light and does not tarnish
They show a real image
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Part of 3. Waves — see every lesson and quiz in this unit.
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