CAIE IGCSE Physics 3.2.2.6 Refractive Index N As the Ratio of Questions

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

Exam points

State that a scalar has magnitude only whereas a vector has both magnitude and direction.
Classify common quantities such as speed, mass and energy against velocity, force and momentum.
Justify a scalar or vector classification using the presence or absence of direction.

[Maximum number: 2]

The lens in a magnifying glass is a converging lens.

The refractive index of the glass used to make the lens is 1.5 .

The speed of light in air is $3.0 \times 10^{8} \mathrm{~m} / \mathrm{s}$ .

Calculate the speed of light in the glass.

$2.0 \times 10^{8} \mathrm{~m} / \mathrm{s}$ $n=c / v_{\mathrm{g}} \mathbf{O R}\left(v_{\mathrm{g}}=\right) c / n \mathbf{O R}\left(v_{\mathrm{g}}=\right) 3(.0) \times 10^{8} / 1.5$

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CAIE IGCSE Physics 3.2.2.6 Refractive Index N As the Ratio of Questions question 1