Polarisation and Dispersion (Leaving Cert Physics): Flashcards

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Polarisation and Dispersion
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Polarised light

Light vibrating in one plane only

Unpolarised light

Light vibrating in all possible directions

Two perpendicular polarising filters effect

No light gets through

Dispersion

White light separated into component colours

Prism: colour refracted most

Violet

Prism: colour refracted least

Red

Diffraction grating equation

dsin⁡θ=nλd \sin \theta = n\lambda

Grating: colour that deviates most

Red

How polaroid sunglasses reduce glare

Block horizontally polarised reflected light

Red deviation: prism vs grating

Prism: least; Grating: most

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