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3.2.2 Refraction of light

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Question 26

A student determines the refractive index nnn of a rectangular transparent block using a ray-tracing method with optical pins.

After outlining the block and tracing the path of the light rays, the student measures the following lengths from their drawing:

  • Length a=63 mma = 63\text{ mm}a=63 mm
  • Length b=41 mmb = 41\text{ mm}b=41 mm

The refractive index nnn is calculated using the equation:

n=ab n = \frac{a}{b} n=ba​
a.

Calculate the value of the refractive index nnn. Give your answer to an appropriate number of significant figures (2 or 3 s.f.).

[2]
b.

The first trial of this experiment was conducted at an angle of incidence i=30∘i = 30^\circi=30∘. Suggest two additional, suitable values for the angle of incidence iii that the student should use to repeat the experiment and improve the reliability of the results.

[2]
c.

State two practical precautions that should be taken during this optical pin experiment to ensure accurate measurements.

[2]
Markscheme

3.2.2 Refraction of light Questions

  1. IGCSE
  2. /Physics
  3. /3.2.2 Refraction of light

100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.

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