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Waves (Wave Motion (STROBOSCOPE- shines a bright light at intervals in…
Waves
Wave Motion
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EM waves consist of a magnetic and electric field, perpendicular to each other. The two oscillating fields are linked, ie. if you change one, the other changes
When the vibrations of the string are in all directions, the wave in unpolarised. But if you put if through a picket fence, only one direction of oscillations will pass through. This is polarised.
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Lenses
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Focal, length is the distance between the focal point and the lens
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Shortsighted uses concave/diverging lenses (negative power since focal point is virtual) and long sighted use convex/converging lenses
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