CAIE IGCSE Physics: Refractive Index from Wave Speed Question Bank

Practise defining refractive index as a speed ratio and linking wave speed changes to refraction between two optical regions.

Exam points

state n as the ratio of wave speeds in two regions, using correct order
link a change in wave speed at a boundary to the size of refractive index

[Maximum number: 1]

A ray of light is incident on a soap film. Fig. 5.1 shows a magnified image of a small part of the soap film. The ray of light is refracted as it enters the soap film.

$Figure for Question 3.2.2.6—Refractive index, n, as the ratio of question 1 — CAIE IGCSE Physics$

soap film
```
air
```

The refractive index of the soap film is 1.28 .

Define refractive index in terms of the speed of light.

(refractive index is) the ratio of the speed of light in two different regions owtte

OR ( refractive index $=) \frac{\text { speed of light in air }}{\text { speed of light in (soap) film }}$

B1

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