yt6

Classified in Physics

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wavelength-is the distance from 1 peak to the next frequency-how many complete waves there are per second. amplitude-is the height of the wave. wavespeed=frequencyXwavelength Transverse waves: the vibrations are at 90º to the direction energy is transferred by the wave. longitudinal: the vibrations are along the same direction as the wave transfers energy. Reflection of light lets us see things. LAW OF REFLECTION: angle of incidence=angle of reflection. Draw a ray diagram for an image in a plane mirror (the image is the same size as the object, it is as far behind the mirror as the object is in front. Its formed from diverging rays which means its a virtual image) waves can be refracted (experiment: using a light source and a rectangular glass block, shine lightray at an angle into the block. Some of the light gets reflected but a lot of it passes through the glass and gets refracted as it does so. (MORE denser, towards the normal because it slows down, LESS denser so it speeds up and bends away from normal)(TRIANGULAR PRISMS disperse white light) Every transparent material has a refractive index. Snells law:n=sin(i)-sin(r) you can use snells law to find critical angles. SinC=1-n (n=refractive index)

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