Refraction, diffraction and interference (AQA A-Level Physics): Quizzes

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Refraction at a plane surface
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What does the refractive index of a material measure?

How much it slows down light

What is the formula for refractive index nn?

n=ccsn = \frac{c}{c_s}

When light enters a more optically dense medium, which way does it bend?

Towards the normal

What is Snell's Law?

n1sin⁡θ1=n2sin⁡θ2n_1 \sin \theta_1 = n_2 \sin \theta_2

What is the formula for critical angle θc\theta_c?

sin⁡θc=n2n1\sin \theta_c = \frac{n_2}{n_1}

When does total internal reflection occur?

When angle of incidence > critical angle

In optical fibres, how do core and cladding refractive indices compare?

Core higher than cladding

What does absorption in optical fibres reduce?

Signal amplitude

What causes modal dispersion in optical fibres?

Different light paths

How is material dispersion reduced?

Using monochromatic light

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