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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

3.2.4 Refractive Index – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Refractive index is calculated using
n = i / r
n = sin i / sin r
n = cos i / cos r
n = sin r / sin i
2.
A ray hits glass at i = 45° and r = 28°. n is about
2.43
0.66
1.51
1.61
3.
Which has the greatest speed of light?
Diamond
Glass
Water
Air
4.
A material has n = 2.0. The speed of light in it is
1.0 × 108 m s−1
1.5 × 108 m s−1
6.0 × 108 m s−1
3.0 × 108 m s−1
5.
The graph of sin i against sin r for a block is a straight line through the origin. Its gradient is
1 / n
the critical angle
the refractive index
the speed of light
6.
(Supplement) A material has n = 1.25. Its critical angle is
39°
90°
37°
53°
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Part of 3. Waves — see every lesson and quiz in this unit.
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